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 [stra´tum, strat´um] (L.)
a sheetlike mass of tissue; see also lamina and layer.
stratum basa´le the deepest layer of the epidermis, composed of a single layer of basophilic cells. Called also basal layer of epidermis.
stratum cor´neum the outer horny layer of the epidermis, consisting of cells that are dead and desquamating. Called also horny layer.
stratum germinati´vum
1. the stratum basalis and stratum spinosum considered together; called also malpighian layer.
2. the lower layer of the nail, from which the nail grows; called also germinative layer.
stratum granulo´sum the cell layer of the epidermis lying between the stratum lucidum and the stratum spinosum. Called also granular layer.
1. the deep layer of the cortex of the cerebellum.
2. the layer of follicle cells lining the theca of the vesicular ovarian follicle; called also granular layer.
stratum lu´cidum the clear translucent layer of the epidermis, just beneath the stratum corneum. Called also clear layer.
stratum spino´sum the layer of the epidermis between the stratum granulosum and stratum basalis, marked by the presence of prickle cells; called also spinous layer and prickle-cell layer.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


, gen.


, pl.


(strat'ŭm, tă; strā'tŭm; tī), The correct plural of this word is strata, not strati or stratae.
One of the layers of differentiated tissue, the aggregate of which forms any given structure, such as the retina or the skin.
See also: lamina, layer.
[L. sterno, pp. stratus, to spread out, strew, ntr. of pp. as noun, stratum, a bed cover, layer]
Farlex Partner Medical Dictionary © Farlex 2012


(strā′təm, străt′əm)
n. pl. stra·ta (-tə) or stra·tums
Biology A layer of tissue: the epithelial stratum.

stra′tal (strāt′l) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


, pl. strata (strā'tŭm, -tă)
One of the layers of differentiated tissue, the aggregate of which forms any given structure, such as the retina or the skin.
See also: lamina, layer
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


, pl. strata (strā'tŭm, -tă)
One of the layers of differentiated tissue, the aggregate of which forms any given structure.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
2003, who otherwise take the same general approach as Ito and Mester to stratal differentiation.
Caption: FIGURE 5: Spatial patterns of fault/fracture systems on some important stratal levels traced by seismic reflection surfaces in northern Tarim.
4) that the positing of such relational/structural changes is empirically unwarranted, and that since they introduce an unnecessary enhancement of the capacity of the grammar, they should not be entertained in principle: there are no intraclausal changes of relation (or the equivalent in stratal diagrams) or of (in this case) relationally-sensitive position.
In the first phase detachment folding along Eocene evaporites had accommodated horizontal stratal shortening which is superimposed by vertical crustal telescoping by thrusting emanating from basal detachment.
(1996b): Growth stratal records of instantaneous and progressive limb rotation in the Precordillera thrust belt and Bermejo basin, Argentina.
Whilst Pennsylvanian studies now commonly invoke eustatic sea-level fluctuations linked to glacial-interglacial rhythmicity as the main cause of stratal cyclicity, recent analyses of the Joggins section have emphasized the overriding importance of basinal subsidence in generating flooding surfaces at this site (Davies and Gibling 2003).
Later on, this inference was discarded due to the fact that stratal stacking patterns form in response to relative sea level changes (subsidence and eustasy) rather than to just eustasy (Posamentier and Allen, 1999).
Stratal extension in thrusts of footwalls, Makran accretionary prism - implications for thrust tectonics.