meg·a·lo·maniac I. \| ̷ ̷ ̷ ̷ ̷ ̷+\noun Etymology:megal- + maniac : one affected with or exhibiting megalomania II. adjective ormeg·a·lo·maniacal\“+\; ormeg·a·lo·manic\“+\ : belonging to, exhibiting, or affected with megalomania < a once megalomaniac motion picture industry — Cecil Beaton >