‖Hy′dro‐zo″a (?), n. pl. [NL., fr. E. hydra + Gr. ζο̑ͅον an animal.] (Zoöl.) The Acalephæ; one of the classes of cœlenterates, including the Hydroidea, Discophora, and Siphonophora.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.