{ Hy″dro‐some (?), ‖Hy′dro‐so″ma (?) }, n. [NL. hydrosoma. See Hydra, and -some body.] (Zoöl.) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.