noun, plural hy·dro·the·cae [hahy-druh-thee-kee] /ˌhaɪ drəˈθi ki/. Zoology.

the part of the perisarc covering a hydranth.

Nearby words

  1. hydrosulphide,
  2. hydrosulphite,
  3. hydrosulphurous acid,
  4. hydrosyringomyelia,
  5. hydrotaxis,
  6. hydrotherapeutics,
  7. hydrotherapy,
  8. hydrothermal,
  9. hydrothermal vent,
  10. hydrothionemia

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. 2019