WordReference Random House Unabridged Dictionary of American English © 2026
wa′ter flea′, 
  1. Insectsany of various small crustaceans that move about in the water like fleas, as those of the genus Daphnia.
  • 1575–85

Collins Concise English Dictionary © HarperCollins Publishers::
water flea n
  1. any of numerous minute freshwater branchiopod crustaceans of the order Cladocera, which swim by means of hairy branched antennae
    See also daphnia
'water flea' also found in these entries (note: many are not synonyms or translations):
daphnia - flea

Forum discussions with the word(s) "water flea" in the title:


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