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Hydrotheca

[hahy-druh-thee-kuh]

noun, plural -cae

[-kee] . Zoology.

the part of the perisarc covering a hydranth.

Origin:
1870–75; < Neo-Latin; see hydro-¹, theca

Related forms

hy·dro·the·cal, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hydrotheca is always a great word to know.

So is mollusca. Does it mean:

vertebrate with body hair that nourishes young with milk from mammary glands

phylum comprised of mollusks

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