Definitions for theca
ˈθi kəthe·ca

Princeton's WordNetRate this definition:3.0 / 2 votes

1. theca, sacnoun

   a case or sheath especially a pollen sac or moss capsule

2. thecanoun

   outer sheath of the pupa of certain insects

WiktionaryRate this definition:0.0 / 0 votes

1. thecanoun

   Any external case or sheath.

2. thecanoun

   The pollen producing organ usually found in pairs and forming an anther.

3. thecanoun

   The twin layers of cells surrounding the basal lamina of an ovarian follicle

4. thecanoun

   The membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates

5. thecanoun

   The calcareous wall of a corallite, the exoskeleton of a coral polyp

WikipediaRate this definition:0.0 / 0 votes

1. Theca

   In biology, a theca (plural thecae) is a sheath or a covering.

ChatGPTRate this definition:0.0 / 0 votes

1. theca

   Theca generally refers to a protective casing or envelope around an organ, cell, or other structure, predominantly found in biological organisms. However, its specific definition can vary depending on the context. For instance, in botany, theca refers to the part of an anther containing pollen, while in zoology, it can refer to a cell wall or shell in various organisms.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Thecanoun

   a sheath; a case; as, the theca, or cell, of an anther; the theca, or spore case, of a fungus; the theca of the spinal cord

2. Thecanoun

   the chitinous cup which protects the hydranths of certain hydroids

3. Thecanoun

   the more or less cuplike calicle of a coral

4. Thecanoun

   the wall forming a calicle of a coral

WikidataRate this definition:0.0 / 0 votes

1. Theca

   A theca refers to any case, covering, or sheath. In botany, the theca of an angiosperm consists of a pair of microsporangia that are adjacent to each other and share a common area of dehiscence called the stomium. Any part of a microsporophyll that bears microsporangia is called an anther. Most anthers are formed on the apex of a filament. An anther and its filament together form a typical stamen, part of the male floral organ. The typical anther is bilocular, i.e. it consists of two thecae. Each theca contains two microsporangia, also known as pollen sacs. The microsporangia produce the microspores, which for seed plants are known as pollen grains. If the pollen sacs are not adjacent, or if they open separately, then no thecae are formed. In Lauraceae, for example, the pollen sacs are spaced apart and open independently. The tissue between the locules and the cells is called the connective and the parenchyma. Both pollen sacs are separated by the stomium. When the anther is dehiscing, it opens at the stomium. The outer cells of the theca form the epidermis. Below the epidermis, the somatic cells form the tapetum. These support the development of microspores into mature pollen grains. However, little is known about the underlying genetic mechanisms, which play a role in male sporo- and gametogenesis.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Theca

   thē′ka, n. a sheath, case, or sac, a spore-case: a case for a corporal-cloth:—pl. Thē′cæ.—adjs. Thē′cal, Thē′cate.—ns. Thē′caphore, a receptacle bearing thecæ; Thē′caspore, a spore produced in a theca.—adjs. Thecaspō′rous; Thecif′erous, bearing thecæ; Thē′ciform, thecal in use or form.—n. Thē′cium, the part of the apothecium containing the organs of the fruit in lichens. [Gr. thēkē.]

EntomologyRate this definition:0.0 / 0 votes

1. Theca

   a case or covering: specifically applied to the fleshy covering of the fly-mouth; to the cases of the Trichopterous larvae; to the lower piece of the male genitalia in Homoptera; and to the outer covering of the pupa.

Matched Categories

1. • Natural Covering
   • Sheath

Usage in printed sourcesFrom: 

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Anagrams for theca »

1. cheat

2. tache

3. teach

4. Teach

How to pronounce theca?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say theca in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of theca in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of theca in Pythagorean Numerology is: 1

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=theca
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Theca
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Theca
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/theca
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=theca
7. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=theca
8. ^ Entomology
   https://www.gutenberg.org/files/22748/22748-h/22748-h.htm#:~:text=theca
9. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=theca