[di.sas.ter] n [MF & OIt; MF desastre, fr. OIt disastro, fr. dis- (fr. L) + astro star, fr. L astrum--more at astral] (1591) 1: a sudden calamitous event bringing great damage, loss, or destruction; broadly: a sudden or great misfortune or failure
2. obs: an unfavorable aspect of a planet or star