water flea

Noun water flea has 2 senses

• water flea(n = noun.animal) cyclops - minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms; Array
is a kind of copepod, copepod crustacean
is a member of genus cyclops

• water flea(n = noun.animal) daphnia - minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae; Array
is a kind of branchiopod, branchiopod crustacean, branchiopodan
is a member of genus daphnia