amidogen

from The Century Dictionary.

• noun A hypothetical radical composed of two equivalents of hydrogen and one of nitrogen, NH₂.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A compound radical, NH2, not yet obtained in a separate state, which may be regarded as ammonia from the molecule of which one of its hydrogen atoms has been removed; -- called also the amido group, and in composition represented by the form amido.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry, dated A compound radical, NH2, not yet obtained in a separate state, which may be regarded as ammonia from the molecule of which one of the hydrogen atoms has been removed; called also the amido group.