'Geoduck' definitions:

Definition of 'geoduck'

From: WordNet
noun
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the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell

Definition of 'Geoduck'

From: GCIDE
  • Geoduck \Ge"o*duck\, 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]