Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of hydrotheca is as below...

Hydrothecae :: Hydrothecae (pl. ) of Hydrothec.

Hydrothecas :: Hydrothecas (pl. ) of Hydrothec.

Hydrotheca :: Hydrotheca (n.) One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian..

Sertularia :: Sertularia (n.) A genus of delicate branching hydroids having small sessile hydrothecae along the sides of the branches.

Sertularian :: Sertularian (n.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively..

Campanularian :: Campanularian (n.) A hydroid of the family ampanularidae, characterized by having the polyps or zooids inclosed in bell-shaped calicles or hydrothecae..

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