Oil
WordNet
noun
(1) Oil paint containing pigment that is used by an artist
(2) Any of a group of liquid edible fats that are obtained from plants
(3) A slippery or viscous liquid or liquefiable substance not miscible with water
verb
(4) Administer an oil or ointment to ; often in a religious ceremony of blessing
(5) Cover with oil, as if by rubbing
"Oil the wooden surface"