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layer |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.06 sec. |
layer(1) One of several "drawing boards" or "canvasses" for creating elements in a picture. See layers. layer 1. one of four or more levels of vegetation defined in ecological studies: the ground or moss layer, the field or herb layer, the shrub layer, and one or more tree layers 2. a laying hen 3. Horticulture a. a shoot or branch rooted during layering b. a plant produced as a result of layering
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Cementoossifying fibroma is a rare nonodontogenic tumor of the periodontal membrane that arises from the mesodermal germ layer This nonneoplastic, locally destructive tumor has occurred as an osseous lesion in the mandible, the maxilla, the zygoma, all the paranasal sinuses, and the orbital and petromastoid regions. 5, 1998--Human pluripotent stem cells -- cells with the demonstrated ability to differentiate in vitro into all three embryonic germ layers -- have been successfully derived in culture by scientists at the Johns Hopkins University School of Medicine, according to a paper to be published in the November 10 issue of Proceedings of the National Academy of Sciences. Spheres are made up primarily of pluripotential progenitor cells that are capable of differentiating into cell types from the three germ layers. |
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