μι-άστωρ · mi-astōr — LSJ
crime-stained wretch who pollutes others, A. Ch. 944, S. OT 353, El. 275; μ. Ἑλλάδος E. Or. 1584: in later Prose, Jul. Or. 2.58d.
avenger of such guilt (cf. ἀλάστωρ), A. Eu. 177 (unless in signf. I), S. El. 603, E. Med. 1371.