water flea
wa·terf·lea
noun
1.
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
2.
minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.