geo·duck /ˈguiˌdʌk/
  巨蚌的一種
  Ge·o·duck n.  Zool. A gigantic clam (Glycimeris generosa) of the Pacific coast of North America, highly valued as an article of food.
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  geoduck
       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           and cannot be withdrawn into the shell