1. n. [Drilling Fluids]
A chemical with formula CaO, commonly called quick lime. When hydrated with one mole of water, it forms slaked lime, Ca(OH)2. Quick lime is used in preference to slaked lime at oil mud mixing plants because it generates heat when it becomes slaked with water and therefore speeds up emulsification by the reaction to form calcium fatty-acid soap.
See: calcium hydroxide, quick lime