amidideChem.|ˈæmɪdaɪd| [f. amide + -ide.] A simple compound of amidogen with another element or complex radical. 1854Pereira Mat. Med. (ed. 4) I. 437 The amidide of hydrogen (ammonia).1869Eng.Mech. 19 Mar. 581/3 It was proposed to regard the two molecules..as an amidide of ammonium NH4, NH2.