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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 hydrotheca
 螅鞘; 螅鞘

From: Webster's Revised Unabridged Dictionary (1913)

 Hy·dro·the·ca n.; pl. L. Hydrothecæ E. Hydrothecas   Zool. One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian.