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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

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.

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.

layer

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.
References in periodicals archive ?
"Enterprises that start by deploying lower levels of the layered stack can help to stave off immediate threats, with the assurance that these layers are part of an overall strategy that relies on basic fraud prevention principles, such as user and account profiling that have generally stood the test of time."
6 in The generalized ray theory and transient responses of layered elastic solids, in Physical Acoustics, Vol.
Brekhovskikh, Waves in Layered Media, Academic Press, New York (1960).
This is probably the most highly layered coex film in medical packaging anywhere in the world.
More recently, Winpak has qualified highly layered blown films for medical packaging that are made on lines with eight and nine extruders in its Senoia, Ga., plant.
That means there's still plenty of room to downgauge further, especially in the highly layered films.
Highly layered films apply only to cast stretch film for machine wrap.
He finds the idea of landing on the layered terrains to search for signs of the earliest Martian life "incredibly provocative."
Scattered across the planet, the layered formations are common in such places as the impact craters of western Arabia Terra, the intercrater plains of northern Terra Meridiani, and the chasms of the giant canyon Valles Marineris.
Processors are finding new medical and industrial markets for highly layered films.
Like the first layered GMR materials, the initial granular GMR films required large magnetic fields to show the drop in resistance.