Of a lamp, flame, etc.: producing little light; dim. Also: unlit; extinguished.

Of a fire, flame, light: Extinguished, quenched, put out; no longer burning. extinct volcano n. a volcano that has ceased eruption; also figurative…

That has been quenched, in various senses; spec. †(a) (of lime) slaked (obsolete); (b) (of a heated object) cooled rapidly in cold water, oil, etc…