Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A horizontal layer of material, especially one of several parallel layers arranged one on top of another.
  • noun Geology A bed or layer of sedimentary rock that is visually distinguishable from adjacent beds or layers.
  • noun Any of the regions of the atmosphere, such as the troposphere, that occur as layers.
  • noun Biology A layer of tissue.
  • noun A level of society composed of people with similar social, cultural, or economic status.
  • noun One of a number of layers, levels, or divisions in an organized system.

from The Century Dictionary.

  • noun A layer of material, formed either naturally or artificially.
  • noun In archæol. excavations, one of the layers of deposits left by successive civilizations, as in the overlying cities at Hissarlik, the ancient Troy.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geol.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
  • noun A bed or layer artificially made; a course.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One of several parallel horizontal layers of material arranged one on top of another.
  • noun geology A layer of sedimentary rock having approximately the same composition throughout.
  • noun Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
  • noun biology A layer of tissue.
  • noun A class of society composed of people with similar social, cultural, or economic status.
  • noun ecology A layer of vegetation, usually of similar height.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
  • noun people having the same social, economic, or educational status
  • noun an abstract place usually conceived as having depth

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin strātum ("a spread for a bed, coverlet, quilt, blanket; a pillow, bolster; a bed"), neuter singular of strātus, perfect passive participle of sternō ("spread").

Support

Help support Wordnik (and make this page ad-free) by adopting the word stratum.

Examples

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.