Reduced by fire to powder or ashes.

Prepared by calcination: as, calcined magnesia; calcined ore.

Refined or purified by subjection to heat or the action of fire: as, calcined air.

verb. Simple past tense and past participle of calcine.

adjective. converted by calcination

"Originally it referred to the form of gypsum which has been heated to a high temperature to drive off the water in its crystal structure; this is called calcined gypsum."

calcine