| 释义 |
thecaenUK
the·ca T0146500 (thē′kə)n. pl. the·cae (-sē′, -kē′) A case, covering, or sheath, such as the covering of the pollen sacs of an anther or the thick cell wall of certain dinoflagellates.
[Latin thēca, case, receptacle, from Greek thēkē; see dhē- in Indo-European roots.]
the′cal (-kəl) adj.theca (ˈθiːkə) n, pl -cae (-siː) 1. (Botany) botany an enclosing organ, cell, or spore case, esp the capsule of a moss2. (Zoology) zoology a hard outer covering, such as the cup-shaped container of a coral polyp[C17: from Latin thēca, from Greek thēkē case; related to Greek tithenai to place] ˈthecal, ˈthecate adjthe•ca (ˈθi kə)
n., pl. -cae (-sē). 1. a case or sheath enclosing an animal organ, structure, etc., as the horny covering of an insect pupa. 2. a sac, cell, capsule, or sporangium of a plant or mushroom. [1655–65; < Latin thēca < Greek thḗkē case, cover, akin to tithénai to place, put] the′cal, the′cate (-kɪt, -keɪt) adj. Thesaurus| Noun | 1. | theca - a case or sheath especially a pollen sac or moss capsulesaccovering, natural covering, cover - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover" | | 2. | theca - outer sheath of the pupa of certain insectssheath, case - an enveloping structure or covering enclosing an animal or plant organ or part |
TranslationsThecaenUK
theca[′thē·kə] (anatomy) The sheath of dura mater which covers the spinal cord. (botany) A moss capsule. A pollen sac. (histology) The layer of stroma surrounding a Graafian follicle. (invertebrate zoology) The test of a testate protozoan or a rotifer. Theca various types of sheath in animals and plants: (1) A cell wall in certain amoebae (thecamoebae). (2) A chitinoid membrane in hydroid polyps; hence the division into the suborders Thecaphora and Athecata. (3) The connective tissue surrounding ovarian follicles in vertebrates (theca folliculi). (4) A tooth socket in the jawbone of mammals and crocodiles. (5) A capsule for spores in mosses. (6) The valve of a silicified test; in diatoms, the upper half is the epitheca and the lower half, the hypotheca. (7) The pollen sac of an anther in angiosperms. thecaenUK
theca [the´kah] (L.) a case or sheath. adj., adj the´cal.theca cor´dis pericardium.theca folli´culi an envelope of condensed connective tissue surrounding a vesicular ovarian follicle; it is composed of an internal vascular layer (theca interna) and an external fibrous layer (theca externa).the·ca, pl. the·cae (thē'kă, thē'sē), A sheath or capsule. [G. thēkē, a box] theca (thē′kə)n. pl. the·cae (-sē′, -kē′) A case, covering, or sheath, such as the covering of the pollen sacs of an anther or the thick cell wall of certain dinoflagellates.
the′cal (-kəl) adj.the·ca, pl. thecae (thē'kă, -sē) A sheath or capsule. [G. thēkē, a box]theca A casing, outer covering or sheath.theca - a sheath or case.
- the protective sheath surrounding the GRAAFIAN FOLLICLE.
- an obsolete term for ASCUS.
THECA
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| THECA➣The Hut Environmental and Community Association (Queensland, Australia) |
thecaenUK
Related to theca: theca folliculiSynonyms for thecanoun a case or sheath especially a pollen sac or moss capsuleSynonymsRelated Words- covering
- natural covering
- cover
noun outer sheath of the pupa of certain insectsRelated Words |