from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various water fleas of the genus Daphnia, some species of which are commonly used as food for aquarium fish.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A water flea of the genus Daphnia.

from the GNU version of the Collaborative International Dictionary of English

  • n. A genus of the genus Daphnia.

from The Century Dictionary and Cyclopedia

  • n. A genus of minute fresh-water cladocerous entomostracous crustaceans, the type of the family Daphniidœ, and representative of the whole order Daphniacea or Cladocera.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae


New Latin Daphnia, genus name, from Greek Daphnē, Daphne.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the genus name. (Wiktionary)


  • In the lab, Diamond recently showed a visitor how he exposed tiny water fleas called daphnia to titanium dioxide nanoparticles.

    News & Features from Minnesota Public Radio

  • Try offering less dried foods, especially pellets, or offer some daphnia which is believed to act as a laxative.

    Practical Fishkeeping

  • I was involved with an after school science program where one group tested the effects on daphnia of the components of sports drinks.

    I heart Daphnia

  • Daphnia are used as "biomoitors"--if the daphnia start acting beserk, something is wrong with the water.

    I heart Daphnia

  • There were all kinds of tiny animals in there, water beetles and daphnia and so on and so forth.

    True Amphibian Crime Part Two: The Transbay Newt Shuffle

  • I hardly spend time contemplating the daphnia I carelessly tossed into the compost today, and the daphnia left certainly do not spend any time pondering me.

    Late November

  • So I pull out yards and yards of elodea, and along with it snails and daphnia and copepods and stentorians and paramecia.

    Late November

  • So now one has the red silverfish-like shrimp, daphnia and small clams, and another has the anostracans.

    grouse Diary Entry

  • Such studies typically find strong trophic cascades in aquatic environments, where big fish eat minnows, which eat the tiny algae-eating crustaceans called daphnia.


  • But if takes the same daphnia down the hall and exposes it to a lamp that mimics sunlight, it will die within hours.

    News & Features from Minnesota Public Radio


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