Now updated for CSW19. New words, if any, and new inflections of existing words, are shown in red.
| abalone | a sea snail of rocky coasts, aka ORMER. |
| ammonite | the coiled shell of an extinct mollusc. |
| argonaut | a sort of CUTTLEFISH, aka paper nautilus. [Gk. Argo, and nautes, a sailor]. |
| ataata | (Maori) a grazing marine gastropod. |
| belon | a kind of OYSTER. |
| bivalve | a bivalve mollusc. |
| blackhead | a larval clam or mussel attached to the gills of a freshwater fish. |
| bluepoint | a small oyster typically from the south shore of Long Island. |
| brachiopod | a bivalve marine invertebrate. |
| buckie | a large spiral marine shell, esp. the common whelk. [L. buccinum, shellfish]. |
| byssal | of or like BYSSUS. |
| byssus | a filamentous tuft ('beard') by which molluscs attach themselves to rocks > BYSSI or BYSSUSES. |
| calamar calamari calamary | any of various species of squid. Note that CALAMARI is really a plural noun, but can take an -S. |
| capiz | the translucent shell of a bivalve mollusc, used in making jewellery > CAPIZES. |
| cephalopod | any marine mollusc of the class Cephalopoda, characterized by well-developed head and eyes and a ring of sucker-bearing tentacles. The group also includes the octopuses, squids, cuttlefish, and pearly nautilus. |
| cherrystone | a medium-sized QUAHOG. |
| chank | the shell of several species of Turbinella, gastropod molluscs of the E Indian seas, sliced into bangles and worn by Hindu women. |
| chiton | any primitive marine mollusc of the genus Chiton, with an elongated body covered with a shell of movable plates. |
| clam | an edible shellfish of various kinds; (verb) to dig for clams > CLAMS, CLAMMING, CLAMMED. |
| clamlike | like a clam. |
| cockle | a large bivalve mollusc; (verb) to pucker. |
| cohog quahog quohog quahaug | a kind of clam. |
| conch | a kind of shell > CONCHS or CONCHES. |
| coquina | a small American clam used for broth or chowder (also a kind of limestone). |
| cowrie cowry | a kind of shell. |
| cuttle | the cuttlefish, a cephalopod mollusc; (verb) to fold cloth in a particular fashion > CUTTLES, CUTTLING, CUTTLED. |
| cuttlebone | the internal shell of the cuttlefish, used for making tooth-powder, for polishing the softer metals and for cage-birds to sharpen their beaks on. |
| cuttlefish | any cephalopod mollusc of the genus Sepia. |
| dentalium | any mollusc or shell of the genus Dentalium, of scaphopod molluscs whose shells resemble an elephant's tusk > DENTALIA or DENTALIUMS. |
| devilfish | an octopus; also, a huge ray of the Gulf of Mexico and Southern Atlantic coasts > DEVILFISHES. |
| dibranchiate | Having two gills; (noun) any of a certain subclass of cephalopods. |
| dodman hodmandod | a snail; a snail shell. |
| doridoid | a genus of nudibranchiate GASTROPODS, shell-less molluscs with a plumy tuft of gills on the back. |
| escallop | a kind of shell with a wavy edge; (verb) to indent like an escallop > ESCALLOPS, ESCALLOPING, ESCALLOPED. |
| escargot | an edible snail. |
| eugarie yugarie | (Maori) a type fo shellfish, aka PIPI. |
| gaper | a soft-shelled CLAM, with a permanent opening between the valves through which the siphon protrudes. |
| gasteropod gastropod gastropodan | any mollusc of the class Gastropoda, typically having a flattened muscular foot for locomotion and a head that bears stalked eyes. The class includes the snails, whelks, limpets, and slugs. |
| geoduck gweduc gweduck | a large edible clam. |
| glochidium | the larva of a freshwater mussel that develops as a parasite on fish > GLOCHIDIA. |
| gweduc | see GEODUCK. |
| gweduck | see GEODUCK. |
| haliotis | a genus of molluscs > HALIOTES or HALIOTISES. [Gk. hals, sea + ous, otos, ear]. |
| heteropod | any of a group of free-swimming prosobranch gastropods having the foot adapted for swimming. |
| hodmandod | see DODMAN. |
| lamellibranch | any member of the Lamellibranchiata, bivalve molluscs including clams, mussels and oysters. |
| lampshell | a kind of brachiopod with a shell shaped like an antique lamp. |
| limaceous | pertaining to, or like, Limax, or the slugs. |
| limaciform | slug-like. |
| limacine | of, relating to, or resembling a slug. |
| limacology | the study of slugs. |
| limax | a slug > LIMACES. [L. limax, a slug]. |
| limnaeid | any member of the family Limnaeidae, pond-snails. |
| limpet | a gastropod with a conical shell, that clings to rocks. |
| littleneck | a young QUAHOG suitable to be eaten raw. |
| loligo | a genus of cephalopods, including numerous species of squids, common on the coasts of America and Europe > LOLIGOS. |
| malacology | the study of molluscs. |
| melanian | one to a family of fresh-water mollusks, having a turret-shaped shell > MELANIANS. |
| mollusc mollusk | any animal of the phylum Mollusca, members of which (as limpets, snails, cuttlefish, oysters, mussels, etc.) have soft bodies and (usu.) hard shells. [L. molluscus softish, from mollis soft]. |
| molluscan molluskan | (a member) of the molluscs. |
| molluscoid | a member of a now abandoned division of invertebrates of the Molluscoidea, Polyzoa and brachiopods. |
| molluscous | like a mollusc. |
| murex | a genus of shellfish, yielding a purple dye > MUREXES or MURICES. [L. murex]. |
| muskle | a MUSSEL. |
| mussel | any of various marine bivalves of the genus Mytilus and related genera. |
| mytiliform | mussel-shaped. |
| mytiloid | mussel-shaped. |
| nacre | mother-of-pearl or a shellfish yielding it; (verb) to coat with mother-of-pearl > NACRES, NACRING, NACRED. |
| nacreous nacrous | of or like NACRE, mother-of-pearl. |
| nautiloid | like or pertaining to the NAUTILUS; shaped like a nautilus shell. |
| nautilus | a cephalopod of southern seas > NAUTILI or NAUTILUSES. |
| neopilina | a mollusc of the genus Neopilina. |
| nerite | a kind of sea-snail. [Gk. nereites, nerites a sea snail (of various kinds)]. |
| nudibranch | (a member) of the Nudibranchiata, sea slugs. |
| nudibranchiate | a member of the Nudibranchiata, sea slugs. |
| octopod octopodan | an octopus or other eight-armed creature > OCTOPODS or OCTOPODES, OCTOPODANS. |
| octopoid octopodous | relating to an OCTOPOD, an octopus or other eight-armed creature. |
| octopus | a cephalopod > OCTOPI, OCTOPUSES or OCTOPODES. |
| opisthobranch | a type of mollusc having gills, little or no shell, two pairs of tentacles |
| ormer | a sea snail of rocky coasts, aka ABALONE. |
| ostracean | any one of a family of bivalves, of which the oyster is the type > OSTRACEANS. |
| ostraceous ostreaceous | of or relating to oysters. |
| oyster | an edible shellfish; (verb) to gather oysters > OYSTERS, OYSTERING, OYSTERED. |
| paua pawa | a name for the ABALONE shell. |
| pelecypod | designating or pertaining to a bivalve mollusc; (noun) a pelecypod mollusc, a bivalve. |
| pennywinkle periwinkle | a marine snail. |
| perlemoen | another name for ABALONE. |
| pholas | a mollusc of the piddock genus of rock-boring molluscs > PHOLADES. |
| piddock | a rough-shelled, boring, marine bivalve. |
| pipi | an edible shellfish of Australasia > PIPIS. |
| polyp polype | an obsolete term for octopus or cuttlefish, now used for various other marine animals especially an individual of a colonial animal. |
| poulp poulpe | the octopus. |
| prosobranch | any of a subclass of gastropod molluscs > PROSOBRANCHS. |
| pteropod | a small swimming mollusc, often shell-less. |
| pulmonate | a member of the Pulmonata, an air-breathing order or subclass of Gastropoda. |
| quahaug | see COHOG. |
| quahog | see COHOG. |
| queenie | a Solway scallop. |
| quohog | see COHOG. |
| radula | a tonguelike organ of molluscs > RADULAE or RADULAS. |
| ramshorn | a freshwater snail, often kept in aquariums. |
| razorclam razorfish | a lamellibranch mollusc with a shell like an old-fashioned razor handle. |
| rudist rudistid | a cone-shaped extinct mollusc. |
| scallop scollop | a kind of shell; (verb) to indent like a scallop. |
| scaphopod | a member of a class of marine molluscs. |
| scollop | see SCALLOP. |
| seashell | the shell of a marine mollusk. |
| sepiost sepiostaire sepium | cuttlebone. |
| shellfish | a shelled aquatic invertebrate, esp a mollusc or crustacean, or such animals collectively. |
| shipworm | a wormlike lamellibranch mollusc that makes shell-lined tunnels in submerged wood. Aka TEREDO. |
| slug | a land mollusc with a rudimentary shell or none at all; (verb) to strike. |
| sluglike | like a slug. |
| snailfish | a sea snail. |
| snaillike | like a snail. |
| snaily | like a snail; full of snails > SNAILIER, SNAILIEST. |
| spat | the spawn of shellfish; a shellfish larva. |
| spirula | a genus of cephalopods having a shell in the form of a flat spiral > SPIRULAE or SPIRULAS. |
| spoot | the razor-shell mollusc > SPOOTS. |
| squid | any large-headed cephalopod mollusc, esp of the genera Loligo and Ommastrephes, with a long tapering body, ten tentacles and triangular tail fins; (verb) to fish with a squid > SQUIDS, SQUIDDING, SQUIDDED. |
| squidlike | like a squid. |
| stoneborer | any boring mollusc. |
| stromb strombus | a very large gastropod related to the whelk. [Gr. strombos, a spinning-top, snail, whirlwind]. |
| tectibranch | any member of the Tectibranchiata, molluscs including sea-slugs > TECTIBRANCHS. |
| tectibranchiate | of a like a TECTIBRANCH, any member of the Tectibranchiata, molluscs including sea-slugs. |
| tellen tellin | a kind of marine shell. |
| tellinoid | like a TELLIN, a kind of marine shell. |
| terebra | a genus of marine gastropods having a long, tapering spire > TEREBRAE or TEREBRAS. |
| teredo | a genus of long, slender, wormlike bivalve mollusks which bore into submerged wood, aka SHIPWORM > TEREDOS or TEREDINES. |
| toheroa | a kind of New Zealand shellfish. |
| toothshell | any species of Dentalium and allied genera having a tooth-shaped shell. |
| tridacna | a type of giant clam. [Gk. tridaknos, eaten at three bites (applied to a big oyster), from daknein, to bite]. |
| triton | a genus of large gastropods with shells that can be used like conchs. |
| trivalve | anything having three valves, especially a shell. |
| trochus | a genus of gastropods, the top-shells > TROCHI or TROCHUSES. |
| tuatua | (Maori) an edible marine bivalve mollusc. |
| turbo | any one of numerous marine gastropods having a turbinate shell, pearly on the inside, and a calcareous operculum > TURBOS. [L turbo, a whirl, a spinning-top]. |
| univalve univalved | a shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs. |
| veliger | a mollusc larva with a velum, a sail-like locomotor organ. [L. velum, sail, + ger, to bear]. |
| venus | one of a genus of lamellibranch molluscs > VENUSES. |
| volute | any marine shell of the genus Voluta or related genera, allied to the whelks. |
| wallfish | a snail. |
| wentletrap | any of a genus of gasteropod molluscs, having a spiral shell with many deep whorls. [Du. 'spiral staircase']. |
| whelk | a popular name for a number of marine gastropods. |
| whelked whelky | marked with whelk-like protuberances. |
| winkle | a small edible snail-shaped shellfish, aka PERIWINKLE. (Verb) to extract or force out little by little and with difficulty > WINKLES, WINKLING, WINKLED. |
| yugarie | see EUGARIE. |
| zygobranch zygobranchiate | a type of gastropod having paired, symmetrically placed gills. |