snail (n.)

Old English snægl, from Proto-Germanic *snagila (source also of Old Saxon snegil, Old Norse snigill, Danish snegl, Swedish snigel, Middle High German snegel, dialectal German Schnegel, Old High German snecko, German Schnecke "snail"), from *snog-, variant of PIE root *sneg- "to crawl, creep; creeping thing" (see snake (n.)). The word essentially is a diminutive form of Old English snaca "snake," which literally means "creeping thing." Also formerly used of slugs. Symbolic of slowness at least since c. 1000; snail's pace is attested from c. 1400.

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Definitions of snail from WordNet
snail (n.)
freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell;
snail (n.)
edible terrestrial snail usually served in the shell with a sauce of melted butter and garlic;
Synonyms: escargot
snail (v.)
gather snails;
We went snailing in the summer