Definitions from Wiktionary (theca)

▸ noun:  (biology) Any of several external cases or sheaths.
▸ noun:  (biology, botany) The pollen-producing organ usually found in pairs and forming an anther.
▸ noun:  (biology, medicine) The theca folliculi: the twin layers of cells surrounding the basal lamina of an ovarian follicle.
▸ noun:  (biology, medicine) The thecal sac: the portion of the dura mater that surrounds the spinal cord and the cauda equina.
▸ noun:  (biology, microbiology, planktology) The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates.
▸ noun:  (biology, marine biology) The calcareous wall of a corallite, the exoskeleton of a coral polyp.
▸ noun:  (biology, microbiology, mycology) A sporangium: a spore case.
▸ noun:  (Christianity) A case for the corporal cloth used in the Eucharist.
▸ Also see theca


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