sand dollar

sand dollar

noun
any of various flat, disklike sea urchins, as Mellita testudinata or Echinarachnius parma, that live on sandy bottoms off the coasts of the U.S.

Origin:
1880–85, Americanism

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World English Dictionary
sand dollar
 
n
any of various flattened disclike echinoderms of the order Clypeasteroida, of shallow North American coastal waters: class Echinoidea (sea urchins)

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