from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Botany A nutritive tissue within the sporangium, particularly within an anther.
- n. Anatomy A membranous layer or region, especially the iridescent membrane of the choroid of certain mammals.
- n. Anatomy A layer of fibers of the corpus callosum forming the roof of part of the lateral ventricle of the brain.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A membranous layer of tissue
from the GNU version of the Collaborative International Dictionary of English
- n. An area in the pigmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark. Sometimes applied to the whole layer of pigmented epithelium of the choroid.
from The Century Dictionary and Cyclopedia
- n. In botany, the cell or layer of cells which is immediately outside an archesporium. It is disorganized and absorbed as the spores develop and mature. Also tapete.
- n. The pigmentary layer of the retina; the tapetum nigrum.
- n. The fibers from the corpus callosum forming a layer lining the roof of the middle and posterior cornua of the lateral ventricles.
Medieval Latin tapētum, coverlet, from Latin tapēte, *tapētum, from Greek tapēs, tapēt-; see tapestry.(American Heritage® Dictionary of the English Language, Fourth Edition)