thecaPronunciation: /ˈθiːkə/Definition of theca noun (plural thecae /-siː/) a receptacle, sheath, or cell enclosing an organ, part, or structure, in particular: Anatomy the loose sheath enclosing the spinal cord. Zoology a cup-like or tubular structure containing a coral polyp. Botany either of the lobes of an anther, each containing two pollen sacs. (also theca folliculi /fəˈlɪkjʊlʌɪ/) Anatomy the outer layer of cells of a Graafian follicle. Derivatives thecate adjective Origin: early 17th century: via Latin from Greek thēkē 'case'theca in other Oxford dictionaries Definition of theca in the US English dictionary
