"Hydrotheca" is a word in ENGLISH
One of the calicles which, in some Hydroidea
(Thecaphora), protect the hydrants. See Illust. of Hydroidea, and
Campanularian.
Congress may carry on the most wicked and pernicious of schemes under the dark veil of secrecy. The liberties of a people never were, nor ever will be, secure, when the transactions of their rulers may be concealed from them.
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One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. …
Read the complete definitionOne of the Hydroideas.
Read the complete definitionThe Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora.
Read the complete definitionOne of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those …
Read the complete definition