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spider crab

American  

noun

  1. any of various crabs of the family Majidae, having long, slender legs and a comparatively small, triangular body.


spider crab British  

noun

  1. any of various crabs of the genera Macropodia, Libinia, etc, having a small triangular body and very long legs

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of spider crab

First recorded in 1700–10