1. a combining form used in the names of chemical compounds in which the nitro group is present: nitroglycerin.

combining form

  1. indicating that a chemical compound contains a nitro group, -NO 2nitrobenzene
  2. indicating that a chemical compound is a nitrate esternitrocellulose

before vowels nitr-, word-forming element used scientifically and indicating “nitrogen, nitrate” or “nitric acid,” from comb. form of Greek nitron (see nitre). pref.

  1. Nitrate; nitrogen:nitrogenase.
  2. Containing the univalent radical NO2:nitrous.

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