Defn: Of, pertaining to, or containing, nitrosyl; as, nitrosylic acid.

NITROUS
Ni"trous, a. Etym: [L. nitrosus full of natron: cf. F. nitreux. See
Niter.]

1. Of, pertaining to, or containing, niter; of the quality of niter, or resembling it.

2. (Chem.)

Defn: Of, pertaining to, or designating, any one of those compounds in which nitrogen has a relatively lower valence as contrasted with nitric compounds. Nitrous acid (Chem.), a hypothetical acid of nitrogen HNO2, not known in the free state, but forming a well known series of salts, viz., the nitrites. — Nitrous oxide. See Laughing gas.

NITROXYL
Ni*trox"yl, n. Etym: [Nitro- + oxygen + -yl.] (Chem.)

Defn: The group NO2, usually called the nitro group.

NITRUM
Ni"trum, n. Etym: [L., natron. See Niter.] (Old Chem.)

Defn: Niter. Nitrum flammans Etym: [L., flaming niter] (Old Chem.), ammonium nitrate; — probably so called because it deflagerates when suddenly heated.

NITRY
Ni"try, a. (Chem.)