Meaning

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the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the

originFrom Lushootseed gʷidəq, variously understood as reference to its deep digging or resemblance to male genitalia. The unusual spelling of the first syllable is thought to represent editorial hypercorrection of forms with goe- &c. (probably under influence from the common prefix geo-), despite the earlier attestation of forms with geo-. The spelling pronunciation /ˈdʒiːəʊdʌk/ once listed in…

Etymology from Wiktionary, CC BY-SA 3.0