What does amido mean?
The definition of amido
A*mi”do, a.
Etym: [From Amide.] (Chem.)

Containing, or derived from, amidogen. Amido acid, an acid in which a portion of the nonacid hydrogen has been replaced by the amido group. The amido acids are both basic and acid.

— Amido group, amidogen, NH2.