Etymology
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oxy- 
word-forming element meaning "sharp, pointed; acid," from Greek oxys "sharp, pungent" (from PIE root *ak- "be sharp, rise (out) to a point, pierce" ). Also used as a combining form of oxygen.
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omo- 

before vowels om-, word-forming element meaning "raw, unripe," from Greek ōmos "raw," from PIE root *hemo- "raw, sharp-tasting" (source also of Sanskrit amah "raw, uncooked, unripe," Armenian hum; Old Irish om, Welsh of).

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