01 n. The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea.
pl.
Hydrocauli ((#))
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1.
The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea.(Zool.) See: Gymnoblastea, Hydroidea