Grease - definition of grease by The Free Dictionary
grease (grēs) n. 1. Soft or melted animal fat, especially after rendering. 2. A thick oil or viscous substance, especially when used as a lubricant. 3. a. The oily substance present in raw wool; suint. b. Raw wool that has not been cleansed of this oily substance. 4. Slang Something, such as money or influence, that facilitates the attainment of an ...