/ Dictionary / Index O oiler: Meaning and Definition of Find definitions for: oil•er Pronunciation: (oi'lur), [key] — n. a person or thing that oils. a worker employed to oil machinery. any of several devices, other than pressure devices, for feeding lubricating oil to a bearing. an oilcan. Often,an oilskin garment, esp. a coat. a ship using oil as fuel. See an oil well. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oiler (Thesaurus) oiled oil field Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language