- Botany. a layer of cells often investing the archespore in a developing sporangium and absorbed as the spores mature.
- Anatomy, Zoology. any of certain membranous layers or layered coverings, as in the choroid of the eyes of certain animals.
Origin of tapetum
1705–15; < New Latin, special use of Medieval Latin tapētum coverlet (Latin, only plural) < Greek tapēt- (stem of tápēs) carpet, rug
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tapetum
The tapetum lucidum is found in Ungulata, Cetacea and Carnivora.
Iris tapetum: the pigment layer of the compound eye just below the crystalline cone.Explanation of Terms Used in Entomology
John. B. Smith
The subject, however, of the various colours of the tapetum in different animals is not yet understood.The Book of Cats
Charles H. Ross
- a layer of nutritive cells in the sporangia of ferns and anthers of flowering plants that surrounds developing spore cells
- a membranous reflecting layer of cells in the choroid of the eye of nocturnal vertebrates
- a similar structure in the eyes of certain nocturnal insects
- 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
Word Origin and History for tapetum
1713, from Medieval Latin tapetum, from Latin tapete "carpet."
Online Etymology Dictionary, © 2010 Douglas Harper
- A membranous layer or region, especially the iridescent membrane of the choroid of certain mammals.
- 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 Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.