Euphemism
Euphemism (ū"fe*miz'm) , noun
[Greek {not transcribed} from {not transcribed} to use word of a good omen; e'y^ well + {not transcribed} to speak: compare French euphémisme. See Fame.]
(Rhetoric) A figure in which a harsh or indelicate word or expression is softened; a way of describing an offensive thing by an inoffensive expression; a mild name for something disagreeable.