"Hydrotheca" is a word in ENGLISH

hydrotheca ENGLISH
Definition:

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

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The space and light up there in Norfolk is wonderfully peaceful. I find myself doing funny things like gardening, and cooking, which I rarely do in London.

Jeremy Northam

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hydranth ENGLISH

One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. …

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hydroid ENGLISH

One of the Hydroideas.

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hydrozoa ENGLISH

The Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora.

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zooid ENGLISH

One of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those …

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