layer

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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

layer

[′lā·ər]
(computer science)
One of the divisions within which components or functions are isolated in a computer system with layered architecture or a communications system with layered protocols.
(geology)
A tabular body of rock, ice, sediment, or soil lying parallel to the supporting surface and distinctly limited above and below.
(geophysics)
One of several strata of ionized air, some of which exist only during the daytime, occurring at altitudes between 30 and 250 miles (50 and 400 kilometers); the layers reflect radio waves at certain frequencies and partially absorb others.
(metallurgy)
The stratum of weld metal consisting of one or more passes and lying parallel to the welding surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

course

course, 1
1. A layer of masonry units running horizontally in a wall or, much less commonly, curved over an arch; it is bonded with mortar.
2. A continuous row or layer of material, as shingles, tiles, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

layer

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

layer

(1) One of several "drawing boards" or "canvasses" for creating elements in a picture. See layers and flatten layers.

(2) One of several levels in a communications protocol. See OSI model.
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References in periodicals archive ?
Electron micrograph of the mantle layer in control and MeHg-treated embryos.
Outer mantle layer is parenchymatous, cells elongated to irregular in shape, 17-18 um in length and 6-7 um in width, light yellowish, no cell contents, no septa and clamps (Fig.
Loper's group is conducting laboratory experiments to learn more about the behavior of the lower mantle layer, which seismologists have dubbed the D layer.
Anatomically they possess pseudoparenchymatous mantle layers with angular cells throughout and emanating hyphae with wide diameter and simple septa (Plate 1B; Plate 2O-Q).