geoduck

 
Pronunciation: /ˈguːidʌk/

noun

  • a giant mud-burrowing bivalve mollusc occurring on the west coast of North America, where it is collected for food. Its shell valves are not large enough to enclose its body and very long siphon.
    • Panopea generosa, family Hyatellidae

Origin:

late 19th century: from Chinook Jargon