| a combining form meaning “sharp,” “acute,” “keen,” “pointed,” “acid,” used in the formation of compound words: oxycephalic; oxygen; oxymoron. |
| a combining form representing oxygen in compound words, sometimes as an equivalent of hydroxy-: oxychloride. |
| oxy- pref. Oxygen, especially additional oxygen: oxyacetylene. [From oxygen.] |
oxy- or ox-
pref.
Oxygen, especially additional oxygen: oxygenation.