Dictionary

theca

noun the·ca \ˈthē-kə\
plural the·cae \ˈthē-ˌsē, -ˌkē\

Definition of THECA

:  an enveloping sheath or case of an animal or animal part
the·cal \ˈthē-kəl\ adjective

Origin of THECA

New Latin, from Greek thēkē case — more at tick
First Known Use: circa 1666

theca

noun the·ca \ˈthē-kə\   (Medical Dictionary)
plural the·cae \ˈthē-ˌsē, -ˌkē\

Medical Definition of THECA

:  an enveloping case or sheath (as the theca folliculi) of an anatomical part

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