[¦te·trə¦meth·əl·dī¦am·ə·nō·ben′zäf·ə‚nōn] (organic chemistry) [(CH3)2NC6H4]2CO White to greenish, crystalline leaflets with a melting point of 172°C; soluble in alcohol, ether, water, and warm benzene; used in the manufacture of dyes. Also known as Michler's ketone.