ox ‧ y ‧ mo ‧ ron /ˌɒksiˈmɔːrɒn $ ˌɑːksiˈmɔːrɑːn/ BrE AmE noun [countable] technical
[ Date: 1600-1700 ; Language: Greek ; Origin: oxys 'sharp' + moros 'stupid' ]
a deliberate combination of two words that seem to mean the opposite of each other, such as ‘cruel kindness’