noun.
A toxic flammable gas, CH5N, produced by the decomposition of organic matter and synthesized for use as a solvent, in tanning, and in the manufacture of many products, such as dyes and insecticides.
The Century Dictionary and Cyclopedia
noun.
A colorless gas (NH2CH3), having a strong ammoniacal odor, and resembling ammonia in many of its reactions.
the GNU version of the Collaborative International Dictionary of English