tapetum

[tuh-pee-tuhm]

ta·pe·tum

[tuh-pee-tuhm]
noun, plural ta·pe·ta [-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

ta·pe·tal, adjective
Dictionary.com Unabridged
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Tapetum is always a great word to know.
So is green algae. Does it mean:
plants with the vascular tissues xylem and phloem for transporting water and nutrients
group of mostly aquatic eukaryotic organisms which conduct photosynthesis and make their own food
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
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.

The American Heritage® Stedman's Medical Dictionary
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