The Collaborative International Dictionary of English v.0.48:

Euphemism \Eu"phe*mism\ ([=u]"f[-e]*m[i^]z'm), n. [Gr. ? fr. ?
   to use word of a good omen; e'y^ well + ? to speak: cf. F.
   euph['e]misme. See Fame.] (Rhet.)
   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. Euphemistic

WordNet (r) 3.0 (2006):

euphemism
    n 1: an inoffensive or indirect expression that is substituted
         for one that is considered offensive or too harsh [ant:
         dysphemism]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "euphemism":
   Gongorism, affectation, affectedness, amelioration, artfulness,
   artifice, artificiality, cushioning, elegance, euphuism,
   exquisiteness, formalism, formality, goody-goodness,
   goody-goodyism, hyperelegance, indirect, manneredness, mannerism,
   mild, mitigation, mollification, overelaboration, overelegance,
   overniceness, overpreciseness, overrefinement, pedantry,
   preciosity, preciousness, precisianism, pretentiousness, purism,
   substitution, unnaturalness, vague