[strey-tuh, strat-uh, strah-tuh]
a plural of stratum.
(usually considered nonstandard) stratum.

See stratum. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
strata (ˈstrɑːtə)
a plural of stratum
usage  Strata is sometimes wrongly used as a singular noun: this stratum (not strata) of society is often disregarded

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1700, plural of stratum.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

stratum stra·tum (strā'təm, strāt'əm)
n. pl. stra·tums or stra·ta (-tə)

  1. A horizontal layer of material, especially one of several parallel layers arranged one on top of another.

  2. Any of the layers of differentiated tissue forming an anatomical structure.

stra'tal (-təl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
stratum   (strā'təm, strāt'əm)  Pronunciation Key 
Plural strata or stratums
  1. A layer of sedimentary rock whose composition is more or less the same throughout and that is visibly different from the rock layers above and below it.

  2. A layer of tissue, as of the skin or another organ.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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