theca

(redirected from thecae)
Also found in: Thesaurus, Medical, Encyclopedia.

the·ca

(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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

theca

(ˈθiːkə)

n, pl -cae (-siː)

1. (Botany) botany an enclosing organ, cell, or spore case, esp the capsule of a moss

2. (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 adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

the•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.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Switch to new thesaurus

Noun	1.	theca - a case or sheath especially a pollen sac or moss capsule sac covering, 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 insects sheath, case - an enveloping structure or covering enclosing an animal or plant organ or part

Translations

the·ca

n. teca, envoltura o capa que actúa esp. como protectora de un órgano.

English-Spanish Medical Dictionary © Farlex 2012

References in periodicals archive ?

Thecae and ongoing investigation against Pervez Khattak is an apt example.

Double-edged Word

Anther thecae are membranous and very flexible, held together by a rigid gibbous purplish connective (Figure 4B and C) that produces a characteristic scent, which attracted male Euglossa bees.

Reproductive biology of endemic Solanum melissarum Bohs (Solanaceae) and updating of its current geographic distribution as the basis for its conservation in the Brazilian Cerrado/Biologia reprodutiva da endemica Solanum melissarum Bohs (Solanaceae) e atualizacao da distribuicao geografica atual, como base para a sua conservacao no Cerrado Brasileiro

Bischoff (1989) analysed the phylogenetic affinities of byroniids in detail and came to a conclusion that the tube and attachment disks of byroniids are most similar to the attached thecae of the polypoid stage of coronate scyphozoans.

A new Byronia species from the late Ordovician of Estonia/Uus Byronia liik Eesti Hilis-Ordoviitsiumist

Diatoms are unicellular photosynthetic organisms consisting of one (unique) silica cell wall which is composed of two valves called thecae and several girdle bands.

Multi-instrumental characterization of two red pigments in funerary archaeological contexts from Northern Chile/Caracterizacion multi-instrumental de dos pigmentos rojos de contextos arquelogicos funerarios del Norte de Chile/Caracterizacao multi-instrumental de dois pigmentos vermelhos de contextos arquelogicos funerarios do Norte do Chile

Naif Al-Rajhi Investment Company President Al-Rajhi said: "It should be noted here that our partnership with Union Properties is only a step forward toward strategic partnership and alliances between the two countries, and knowledge sharing to increase the local and regional investment opportunities, thus achieving the seminar's overall objective of enhancing trade relations, which will be reflected positively in the national economy and enable us to develop expansion plans in the region." Ahmad Khalaf Al-Marri, general manager of Union Properties, said: "We are keen to support and consolidate economic relations between thecae and the Kingdom, both being among the largest economies in the region.

Plenty of opportunities for Saudi investors in UAE

Flowers sessile, buds clavate; epicalyx greenish; corolla 6-merous, 0.3-0.4 cm in length, greenish, valvate; stamens-6, majors 0.4 X 0.1cm, minors 0.3 X 0.1 cm, included; ovary obovate, 0.2 cm in length; style cylindrical, 0.3-0.4 cm in length, presenting filiform staminodes of compressed thecae. Fruit not observed.

Flora of the State of Paraiba, Brazil: Loranthaceae Juss./Flora do Estado da Paraiba, Brasil: Loranthaceae Juss

at 1 cm from tip, narrowly rounded at apex; flowers 6-7 visible per spiral, subrounded (at least on drying), 3.3-3.6 mm long, 3.4-4 mm wide; tepals drying yellow-brown, minutely papillate, often turned up markedly on drying; lateral tepals 2.2-2.6 mm wide, inner margin broadly rounded, outer margin bluntly 2-sided; stamens held at level of tepals, anthers 0.6 mm long and wide; thecae slightly divaricate; stigma broadly ellipsoid, 7 mm x 6 mm.

A new species of Anthurium (Araceae) from Oaxaca, Mexico

Spiracle I elongate, with fine peritreme and covered by wing thecae; spiracles IIIV ovate, prominent, with strongly sclerotized peritreme; spiracle V-VIII closed.

Larval and pupal descriptions of two Aegopsis species (Coleoptera: Melolonthidae: Dynastinae)

One petal from the inner whorl remains free while all other perianth members fuse to form a floral tube that, together with the exposed thecae (in staminate flowers), forms the floral display.

Homoplasy, pollination, and emerging complexity during the evolution of floral development in the tropical gingers (Zingiberales)

Full browser ?

CITE

Site: Follow: Share:

Open / Close