Wordnet 3.0
NOUN (1)
1.
conjoining contradictory terms (as in `deafening silence');
The Collaborative International Dictionary of English v.0.48:
Oxymoron \Ox`y*mo"ron\, n. [NL., fr. Gr. ???, fr. ??? pointedly
foolish; 'oxy`s sharp + mwro`s foolish.] (Rhet.)
A figure in which an epithet of a contrary signification is
added to a word; e. g., cruel kindness; laborious idleness.
[1913 Webster]
WordNet (r) 3.0 (2006):
oxymoron
n 1: conjoining contradictory terms (as in `deafening silence')
Moby Thesaurus II by Grady Ward, 1.0:
54 Moby Thesaurus words for "oxymoron":
Gordian knot, absurdity, ambiguity, ambivalence, antinomy,
asymmetry, crux, dilemma, disproportion, disproportionateness,
enigma, equivocality, equivocation, heresy, heterodoxy,
heterogeneity, hopelessness, impossibility, impossible,
impossibleness, incoherence, incommensurability, incompatibility,
inconceivability, incongruity, inconsistency, inconsonance, irony,
irreconcilability, knot, knotty point, no chance, node, nodus,
nonconformability, nonconformity, nonplus, paradox, perplexity,
pons asinorum, poser, puzzle, quandary, self-contradiction, teaser,
the impossible, unconformability, unconformity, unimaginability,
unorthodoxy, unthinkability, vexed question, what cannot be,
what cannot happen