- a person who oils machinery, engines, etc.
- a device for oiling machinery, etc.; specif., oilcan
- a tanker for carrying oil, esp. one used to refuel other ships
- Informal an oilskin coat
- (nautical) An oil tanker
- An oil well
- A junior role in the engine room of a ship, senior only to a wiper, consisting mainly of keeping machinery lubricated.