tapetum

tapetum

[tuh-pee-tuhm]
noun, plural tapeta [tuh-pee-tuh] .
1.
Botany. a layer of cells often investing the archespore in a developing sporangium and absorbed as the spores mature.
2.
Anatomy, Zoology. any of certain membranous layers or layered coverings, as in the choroid of the eyes of certain animals.

Origin:
1705–15; < Neo-Latin, special use of Medieval Latin tapētum coverlet (Latin, only plural) < Greek tapēt- (stem of tápēs) carpet, rug

tapetal, adjective
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World English Dictionary
tapetum (təˈpiːtəm)
 
n , pl -ta
1.  a layer of nutritive cells in the sporangia of ferns and anthers of flowering plants that surrounds developing spore cells
2.  a.  a membranous reflecting layer of cells in the choroid of the eye of nocturnal vertebrates
 b.  a similar structure in the eyes of certain nocturnal insects
3.  anatomy a covering layer of cells behind the retina of the eye
 
[C18: from New Latin, from Medieval Latin: covering, from Latin tapēte carpet, from Greek tapēs carpet]
 
ta'petal
 
adj

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Medical Dictionary

tapetum ta·pe·tum (tə-pē'təm)
n. pl. ta·pe·ta (-tə)

  1. A membranous layer or region, especially the iridescent membrane of the choroid of certain mammals.

  2. A layer of fibers of the corpus callosum forming the roof of part of the lateral ventricle of the brain.

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