Hy′dro‐cau″lus (?), n.; pl.Hydrocauli (#). [NL., fr. Gr. ὕδωρ water + � a stalk.] (Zoöl.) The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.