Webster's English Dictionary

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oil

1. oil \'o.i(*)l\ n [ME oile, fr. OF, fr. L oleum olive oil, fr. Gk elaion, 
   fr. (Xelaia olive 1a: any of numerous unctuous combustible substances that 
   are liquid or at l east easily liquefiable on warming, are soluble in ether 
   but not in water, and leave a greasy stain on paper or cloth 1b: PETROLEUM  
   2: a substance of oily consistency  3a: an oil color used by an artist  3b: 
   a painting done in oil colors  4: unctuous or flattering speech  - oil aj
2. oil vt : to smear, rub over, furnish, or lubricate with oil to take on 
   fuel oil