Webster's Revised Unabridged Dictionary · 1913

nitro

nitro ({not transcribed}) , noun

[By shortening of nitroglycerin.]

Nitroglycerin.

nitro- ({not transcribed}) , prefix

1.
A combining form or an adjective denoting the presence of niter.
2.
(Chemistry) A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids; as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene (C6H5.NO2).
Collocations (1)
Nitro group , the radical NO2; -- called also nitroxyl.