WordReference Random House Unabridged Dictionary of American English © 2025
crab louse′. 
  1. InsectsSee under louse (def. 1).
  • 1540–50

Collins Concise English Dictionary © HarperCollins Publishers::
crab louse
  1. a parasitic louse, Pthirus (or Phthirus) pubis, that infests the pubic region in humans
'crab louse' also found in these entries (note: many are not synonyms or translations):

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