hydrotheca

[hahy-druh-thee-kuh]
noun, plural hy·dro·the·cae [hahy-druh-thee-kee] /ˌhaɪ drəˈθi ki/. Zoology.
  1. the part of the perisarc covering a hydranth.

Origin of hydrotheca

From New Latin, dating back to 1870–75; see origin at hydro-1, theca
Related formshy·dro·the·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018