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

Hydrothecae :: Hydrothecae (pl. ) of Hydrothec.

Hydrothecas :: Hydrothecas (pl. ) of Hydrothec.

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