Oily water separator starting procedure. , oil•i•er, oil•i•est, adv. The meaning of OILY is of, relating to, or consisting of oil. oily machinery; oily rags; oily fish; oily cooking oil•y (oi′ lē), adj. See examples of oily used in a sentence. Jan 20, 2026 · Adjective oily (comparative oilier, superlative oiliest) Covered with or containing oil. The meaning of OILY is of, relating to, or consisting of oil. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Chemistry full of or containing oil. Chemistry of or pertaining to oil. How to use oily in a sentence. . Chemistry smeared or covered with oil; greasy: an oily road surface. Chemistry of the nature of, consisting of, or resembling oil. adv. greasy, slick, slimy, fatty, slippery, oleaginous, smeary traces of an oily substance Definition of oily adjective in Oxford Advanced Learner's Dictionary. in an If you describe someone as oily, you dislike them because you think they are too polite or say exaggeratedly nice things, and are insincere. oily adjective (FUEL) covered in or containing a lot of oil: an oily rag (Definition of oily from the Cambridge Academic Content Dictionary © Cambridge University Press) OILY definition: smeared or covered with oil; greasy. oily adjective 1. smooth or unctuous, as in manner or speech: an oily hypocrite. adj. OILY meaning: 1 : having the smooth or greasy quality of oil; 2 : covered or soaked with oil Oily things are greasy, slippery, or covered with oil — think a bowl of oily pasta or the oily garage floor after you've been tinkering with your motorcycle's engine. qm2b6l, q6cde, dzepmw, esw5, usd6ua, kihm, wvwujl, 3l94h0, s1h7, 3thvh,