noun

• One who or that which oils.
• An assistant in the engine room of a ship, senior only to a wiper, mainly responsible for keeping machinery lubricated.
• (nautical) An oil tanker.
• An oil well.
• (firearms) A small (typically thumb-sized) metal container of oil, often containing an integral brush.
• (informal) An oilskin coat.
• (US, ethnic slur) A Mexican.