asteism

from The Collaborative International Dictionary of English v.0.48

Asteism \As"te*ism\, n. [Gr. ? refined and witty talk, fr. ? of
   the town, polite, witty, fr. ? city: cf. F. ast['e]isme.]
   (Rhet.)
   Genteel irony; a polite and ingenious manner of deriding
   another.
   [1913 Webster]