• WordNet 3.6
    • adj branchiopod of or relating to or characteristic of the subclass Branchiopoda
    • n branchiopod aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding
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Webster's Revised Unabridged Dictionary
    • n Branchiopod One of the Branchiopoda.
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Century Dictionary and Cyclopedia
    • n branchiopod An animal belonging to the order Branchiopoda. Also branchiopode.
    • branchiopod Gill-footed; branchiopodous. Also branchiopodan.
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In literature:

In short, she was a branchiopod, to be vulgarly precise, a water-flea.
""Wee Tim'rous Beasties"" by Douglas English