Kies
- A term used in mineralogy to refer to certain sulfide minerals, especially those containing iron and copper. nounThe geologist discovered a rich deposit of kies in the mine.Kies minerals are often associated with the presence of valuable metals.
- A variant spelling of 'keys', referring to devices used to open locks or to operate mechanisms. nounShe couldn't find her kies and was locked out of her house.The janitor carries a large ring of kies for all the doors in the building.