chiasmus
Concise Oxford English Dictionary © 2008 Oxford University Press:
chiasmus /kʌɪˈazməs, kɪ-/
▶noun the inversion in a second phrase or clause of the order of words in the first.
– derivatives
chiastic adjective.
chiastic adjective.
– origin C17 (in the sense ‘crosswise arrangement’): mod. L., from Gk khiasmos, from khiazein (chiasma).
'chiasmus' also found in these Oxford entries:

