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theca

theca (pl. thecae)
1. Shell or test.

2. The cell wall in some protistan algae, e.g. diatoms and dinoflagellates (see DINOPHYCEAE).

3. The dense wall at the margin of a corallite in a scleractinian coral (Scleractinia).

4. In graptolites (Graptolithina), one of the cup-like structures that occur along the stipe, each of which houses an individual member of the colony. Thecae vary from simple, straight-sided tubular structures to those with an introtorted opening, where the thecal aperture faces downward. There are triangulate thecae with very small apertures and in some species the thecae are long, thin, and separated from one another (‘isolate’). In some monograptids the thecae vary in structure along the length of an individual stipe as well as from one species to another. Thecal shape also varies through time.

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"theca." A Dictionary of Earth Sciences. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." A Dictionary of Earth Sciences. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca

"theca." A Dictionary of Earth Sciences. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca

theca

theca The case inside which an individual member of a colony of invertebrates lives. See AUTOTHECA; BITHECA; STOLOTHECA.

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"theca." A Dictionary of Zoology. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." A Dictionary of Zoology. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-1

"theca." A Dictionary of Zoology. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-1

theca

theca receptacle, cell, case. XVII. — L. thēca — Gr. thḗkē case, cover.

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"theca." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/theca-0

"theca." The Concise Oxford Dictionary of English Etymology. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/theca-0

theca

theca The shell-like structure surrounding the cell in certain algae.

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"theca." A Dictionary of Plant Sciences. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." A Dictionary of Plant Sciences. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-0

"theca." A Dictionary of Plant Sciences. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-0

theca

theca (th'ee-kă) n. a sheathlike surrounding tissue.

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"theca." A Dictionary of Nursing. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

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"theca." A Dictionary of Nursing. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/theca

theca

theca See capsule.

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"theca." A Dictionary of Biology. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." A Dictionary of Biology. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-2

"theca." A Dictionary of Biology. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/theca-2

theca

thecaacre, baker, breaker, Chandrasekhar, faker, forsaker, Jamaica, Laker, maker, nacre, partaker, Quaker, raker, saker, shaker, staker, taker, undertaker, waker •bellyacher • matchmaker • bedmaker •dressmaker •haymaker, playmaker •sailmaker • rainmaker •lacemaker, pacemaker •peacemaker • filmmaker • kingmaker •printmaker • holidaymaker •cabinetmaker • moneymaker •merrymaker • watchmaker •clockmaker • lawmaker • homemaker •bookmaker • troublemaker •boilermaker • heartbreaker •safebreaker • Windbreaker •tie-breaker • strikebreaker •icebreaker • jawbreaker •housebreaker • muckraker •boneshaker • caretaker • piss-taker •stavesacre • wiseacre •beaker, Costa Rica, Dominica, eureka, Frederica, Griqua, leaker, loudspeaker, seeker, shrieker, sika, sneaker, speaker, squeaker, streaker, Tanganyika, theca, tikka, Topeka, wreaker

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"theca." Oxford Dictionary of Rhymes. . Encyclopedia.com. 19 Oct. 2017 <http://www.encyclopedia.com>.

"theca." Oxford Dictionary of Rhymes. . Encyclopedia.com. (October 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/theca

"theca." Oxford Dictionary of Rhymes. . Retrieved October 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/theca