stratum

n., pl. -ta (-tə) or -tums.

1. A horizontal layer of material, especially one of several parallel layers arranged one on top of another.
2. Geology. A bed or layer of sedimentary rock having approximately the same composition throughout.
3. Any of the regions of the atmosphere, such as the troposphere, that occur as layers.
4. Biology. A layer of tissue: the epithelial stratum.
5. A level of society composed of people with similar social, cultural, or economic status.
6. One of a number of layers, levels, or divisions in an organized system: a complex poem with many strata of meaning.

[Latin strātum, a covering, from neuter past participle of sternere, to spread. See stratus.]

stratal stra'tal (strāt'l) adj.

USAGE NOTE   The standard singular form is stratum; the standard plural is strata (or sometimes stratums), not stratas.

The singular of strata. See stratified sampling.

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n.pl

(n.pl strata) a layer of the epidermis or the epithelium of the oral mucosa.

strata (pl.)

In geology, a layer of distinctive deposits with surfaces roughly parallel to those above and below.

A bed of sedimentary rock or earth.

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[De]

A single deposit or cultural level.

Pl. strata [L.] a sheetlike mass of tissue of fairly uniform thickness; distinct layers making up various tissues or organs, as of the skin, brain, retina.

• s. avasculosum — the avascular stratum in the margin of the iris.
• s. basale — the mitotically active, basal layer of the epidermis, consisting of columnar to cuboidal keratinocytes on a basement membrane.
• s. corneum — the outer horny layer of the epidermis, consisting of cells that are non-nucleated, keratinized and desquamating.
• s. germinativum — in the epidermis, located between the stratum basale and the stratum granulosum. Together with the basal layer, called the malpighian layer. Called also germinative layer.
• s. granulosum — 1. the layer of cells between the stratum lucidum and the stratum spinosum of the skin, very thin and not always present. Called also the granular layer.
— 2. the deep layer of the cortex of the cerebellum. — 3. the layer of follicle cells lining the theca of the vesicular ovarian follicle. Called also granular layer.
• s. lamellatum — laminae of the hoof corium.
• s. lucidum — the translucent layer of the skin just beneath the stratum corneum. Called also clear layer. Present in the epidermis of the planum nasale of several species and footpads of carnivores.
• s. spinosum — the layer of the epidermis between the stratum granulosum and the stratum basale, marked by the presence of prickle cells; called also spinous layer and prickle-cell layer.
• s. tectorium — the layer of horny scales claimed to exist on the surface of the horse's hoof that gives it the smooth glossy appearance.

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Dansk (Danish)
n. - lag

Nederlands (Dutch)
laag

Français (French)
n. - (Géol) strate, (Biol) couche, couche (sociale)

Deutsch (German)
n. - Schicht, Stratum

Ελληνική (Greek)
n. - στρώμα, διάστρωση, (γεωλ.) πέτρωμα

Italiano (Italian)
strato, falda

Português (Portuguese)
n. - camada (f)

Русский (Russian)
пласт, слой, уровень, страта

Español (Spanish)
n. - capa, estrato

Svenska (Swedish)
n. - skikt, lager, stratum

中文（简体）(Chinese (Simplified))
层, 组织层, 地层, 社会阶层

中文（繁體）(Chinese (Traditional))
n. - 層, 組織層, 地層, 社會階層

한국어 (Korean)
n. - 지층, (조직의) 층, 계층

日本語 (Japanese)
n. - 岩層, 地層, 階層

العربيه (Arabic)
‏(الاسم) طبقه (صخور), طور (تاريخ أو نمو)‏

עברית (Hebrew)
n. - ‮שכבה, רובד, מעמד חברתי‬

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