Etymology
Advertisement
gastropod (n.)
1826, gasteropod (spelling without -e- by 1854), from Modern Latin Gasteropoda, name of a class of mollusks, from Greek gaster (genitive gastros) "stomach" (see gastric) + pous (genitive podos) "foot" (from PIE root *ped- "foot"). From the ventral position of the mollusk's "foot."
Related entries & more 
Advertisement
*ped- 

Proto-Indo-European root meaning "foot."

It forms all or part of: antipodes; apodal; Arthropoda; babouche; biped; brachiopod; cap-a-pie; centipede; cephalopod; cheliped; chiropodist; expedite; expedition; foot; foosball; fetch (v.); fetter; fetlock; gastropod; hexapod; impair; impede; impediment; impeach; impeccable; isopod; millipede; octopus; Oedipus; ornithopod; pajamas; pawn (n.2) "lowly chess piece;" peccadillo; peccant; peccavi; pedal; pedestrian; pedicel; pedicle; pedicure; pedigree; pedology; pedometer; peduncle; pejoration; pejorative; peon; pessimism; petiole; pew; Piedmont; piepowder; pilot; pinniped; pioneer; platypus; podiatry; podium; polyp; pseudopod; quadruped; sesquipedalian; stapes; talipes; tetrapod; Theropoda; trapezium; trapezoid; tripod; trivet; vamp (n.1) "upper part of a shoe or boot;" velocipede.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pad-, accusative padam "foot;" Avestan pad-; Greek pos, Attic pous, genitive podos; Latin pes, genitive pedis "foot;" Lithuanian padas "sole," pėda "footstep;" Old English fot, German Fuß, Gothic fotus "foot."

Related entries & more 
limpet (n.)
type of marine gastropod mollusk, early 14c., earlier lempet (early 14c.), alteration of Old English lempedu, which apparently originally meant "a lamprey" (both cling by sucking), from Medieval Latin lampreda "lamprey; limpet," from Late Latin lampetra "lamprey" (see lamprey). Limpin was a 16c. variant that survived in dialects.
Related entries & more