(n)a large edible clam found burrowing deeply in sandy mud along the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. [ American Indian name. ] (Zool.) A gigantic clam (Glycimeris generosa) of the Pacific coast of North America, highly valued as an article of food. [ 1913 Webster ]