- Bot. a spore case, sac, or capsule
- any sheath or sac enclosing an organ or a whole organism, as the covering of an insect pupa
Origin of thecaModern Latin ; from Classical Latin ; from Classical Greek th?k?, a case ; from Indo-European an unverified form dh?k? ; from base an unverified form dh?-, to place, put from source do, Classical Latin facere
Origin of thecaLatin th&emacron;ca, case, receptacle, from Greek th&emacron;k&emacron;; see dh&emacron;- in Indo-European roots.
(plural thecas or thecae)
- (biology) Any external case or sheath.
- (botany) The pollen producing organ usually found in pairs and forming an anther.
- (medicine) The twin layers of cells surrounding the basal lamina of an ovarian follicle
- (microbiology, planktology) The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates
- (marine biology) The calcareous wall of a corallite, the exoskeleton of a coral polyp
From New Latin, from Latin theca, from Ancient Greek Î¸Î®ÎºÎ· (thÄ“kÄ“, “a case, box, receptacle"), from Ï„Î¯Î¸Î·Î¼Î¹ (tithÄ“mi, “put, set, place").