Liddell–Scott–Jones: ἑτερό-πτωτος

ἑτερό-πτωτος,ον,

A. having cases formed from different stems, e.g.μέγας, μεγάλου, A.D. Pron. 11.4 .

II. -πτωτον,τό,change of case, as a figure of speech, Phoeb. Fig. 1.5 .