The Collaborative International Dictionary of English v.0.48:
Malison \Mal"i*son\, n. [OF. maleicon, L. maledictio. See Malediction, and cf. Benison.] Malediction; curse; execration. [Poetic] [1913 Webster] God's malison on his head who this gainsays. --Sir W. Scott. [1913 Webster]