chalk strata (2)


Borrowed 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). Doublet of estrade.


  • IPA(key): /ˈstɹɑːtəm/, /ˈstɹeɪtəm/


stratum (plural stratums or strata)

  1. One of several parallel horizontal layers of material arranged one on top of another.
    Synonym: tier
    • 1884, Alfred Ronald Conkling, Appleton's Guide to Mexico, page 43:
      It is built of alternate strata of brick and clay, and the sides correspond to the direction of the meridians and parallels.
  2. (geology) A layer of sedimentary rock having approximately the same composition throughout.
    Synonyms: bed, layer
    Coordinate term: seam
    • 1961 November, “Talking of Trains: The subsidence problem”, in Trains Illustrated, page 651:
      An illuminating article in a recent issue of the Eastern Region's Civil Engineering News points out that where coal is worked over a reasonably large area, it is not only the whole of the strata above the workings, but also an area beyond which is liable to subside at varying rates after the coal has been removed.
  3. Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
  4. (biology) A layer of tissue.
  5. A class of society composed of people with similar social, cultural, or economic status.
  6. (ecology) A layer of vegetation, usually of similar height.
  7. (computing) The level of accuracy of a computer's clock, relative to others on the network.
    • 2006, Roderick W. Smith, Linux Samba Server Administration:
      Computers that synchronize themselves to the stratum 1 time servers are known as stratum 2 time servers if they allow others to synchronize to them, and so on.

Related termsEdit


Further readingEdit



From Dutch stratum, from Latin stratum. Doublet of strata.


  • IPA(key): [ˈstratʊm]
  • Hyphenation: stra‧tum


stratum (plural, first-person possessive stratumku, second-person possessive stratummu, third-person possessive stratumnya)

  1. (geology) stratum, a layer of sedimentary rock having approximately the same composition throughout.

Further readingEdit



From strātus, perfect passive participle of sternō (spread).



strātum n (genitive strātī); second declension

  1. a bed-covering, coverlet, quilt, blanket
  2. a pillow, bolster
  3. a bed, couch
  4. a horse-blanket, saddle-cloth
  5. a pavement


Second-declension noun (neuter).

Case Singular Plural
Nominative strātum strāta
Genitive strātī strātōrum
Dative strātō strātīs
Accusative strātum strāta
Ablative strātō strātīs
Vocative strātum strāta




  1. accusative supine of sternō