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NOS (not comparable)

  1. (medical diagnosis) Initialism of not otherwise specified.
    diffuse large B-cell lymphoma, not otherwise specified (DLBCL, NOS)

Usage notes[edit]

  • (Not Otherwise Specified): used as the last qualifier in the definition of a class or category, as a punctuation period that restricts further narrowing of that specification, such as in the UN number for the transportation of dangerous goods; e.g., UN1956 is defined as "Compressed Gas, N.O.S."; whether it is flammable or inert is not specified, so it could be either.


NOS (plural NOSes)

  1. Initialism of Near-Online Storage.
  2. Initialism of Network Operating System.
  3. Initialism of new old stock.
  4. Abbreviation of nitrous oxide.