LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

oxymōrus

oxymōrus (feminine oxymōra, neuter oxymōrum)
Classical[ɔk.syˈmoː.rʊs]Ecclesiastical[ok.siˈmɔː.rus]

Meaning

  1. adjectiveoxymoronic; of or pertaining to a figure of speech in which two words with opposing meanings are used together intentionally for effect, as in the following
    de te autem, Catilina, cum quiescunt, probant, cum patiuntur, decernunt, cum tacent, clamant.But to you, Catiline, by keeping quiet they approve, by allowing me to speak they vote, by their silence they shout out loud.. Cic. Catil. 1.8.21

Declension

singular
formmasculinefeminineneuter
nominativeoxymōrusoxymōraoxymōrum
genitiveoxymōrīoxymōraeoxymōrī
dativeoxymōrōoxymōraeoxymōrō
accusativeoxymōrumoxymōramoxymōrum
ablativeoxymōrōoxymōrāoxymōrō
vocativeoxymōreoxymōraoxymōrum
plural
formmasculinefeminineneuter
nominativeoxymōrīoxymōraeoxymōra
genitiveoxymōrōrumoxymōrārumoxymōrōrum
dativeoxymōrīsoxymōrīsoxymōrīs
accusativeoxymōrōsoxymōrāsoxymōra
ablativeoxymōrīsoxymōrīsoxymōrīs
vocativeoxymōrīoxymōraeoxymōra

oxўmōrus, a, um, adj., = ὀξύμωρος,
I. acutely silly: oxymora verba, expressions which at first sight appear absurd, but which contain a concealed point; so especially of such apparently contradictory assertions as: cum tacent clamant, etc. (Cic. Cat. 1, 8, 21), Pseudo Ascon. ad Cic. Div. in Caecil. 1.

Origins

First attested in the 5th century, from Ancient Greek ὀξύμωρος (oxúmōros), from Ancient Greek ὀξύς (oxús, “sharp, keen”) + μωρός (mōrós, “dull, stupid”)

Quick answers

What does oxymōrus mean in Latin?
oxymōrus, a adjective, means “oxymoronic; of or pertaining to a figure of speech in which two words with opposing meanings are used together intentionally for effect, as in the following”.
How do you pronounce oxymōrus?
In classical Latin, [ɔk.syˈmoː.rʊs]; in ecclesiastical (church) Latin, [ok.siˈmɔː.rus].