from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any external case or sheath.
- n. The pollen producing organ usually found in pairs and forming an anther.
- n. The twin layers of cells surrounding the basal lamina of an ovarian follicle
- n. The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates
- n. The calcareous wall of a corallite, the exoskeleton of a coral polyp
from the GNU version of the Collaborative International Dictionary of English
- n. A sheath; a case
- n. The chitinous cup which protects the hydranths of certain hydroids.
- n. The more or less cuplike calicle of a coral.
- n. The wall forming a calicle of a coral.
from The Century Dictionary and Cyclopedia
- n. In the graptolites, one of the receptacles of the zoöids.
- n. A case; box; sheath.
- n. [capitalized] A genus of pteropods, having a sheath-like shell, typical of the family Thecidæ. Sowerby, 1845. Also named Hyolithes (Eichwald, 1840).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. outer sheath of the pupa of certain insects
- n. a case or sheath especially a pollen sac or moss capsule
Latin thēca, case, receptacle, from Greek thēkē; see dhē- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin, from Latin theca, from Ancient Greek θήκη (thēkē, "a case, box, receptacle"), from τίθημι (tithēmi, "put, set, place"). (Wiktionary)