amidogen

noun1

1. •
   (old-fashioned) The amino radical, •NH₂, the neutral form of the amide ion −NH₂⁻, regardable as the ammonia molecule with one of its hydrogen atoms removed.

   • Ammonia is commonly called a base. It is more correct to call it a SALT, and to consider its components to be the radical amidogen NH₂, and the radical hydrogen =\ H. — 1860