D defs.my
Entry 1 sense Webster, 1913

Nitroso-

· Ni·tro·so- · IPA
01 (� [or] �). (Chem.) A prefix (also used adjectively) designating the group or radical -NO, called the nitroso group, or its compounds.
  1. 1.
    (� [or] �). (Chem.) A prefix (also used adjectively) designating the group or radical -NO, called the nitroso group, or its compounds.(Chem.)