Hydrocaulus
Pronunciation : Hy`dro*cau"lus
Part of Speech : n.;
Etymology : [NL., fr. Gr. "y`dwr water + (Zo?l.)
Definition : Defn: The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea.
pl. Hydrocauli.
Source : Webster's Unabridged Dictionary, 1913