daphnia

Từ điển WordNet v3.1 - WordNet Dictionary

noun

minute freshwater crustacean having a round body enclosed in a transparent shell;
moves about like a flea by means of hairy branched antennae
• Syn:
water flea
• Hypernyms:
branchiopod crustacean, branchiopod, branchiopodan
• Member Holonyms:
genus Daphnia