RhymeZone: desaturate definitions

Definitions of desaturate:

verb: To lessen the saturation of (a colour).
verb: (chemistry) To convert (a saturated compound) to an unsaturated one.
verb: (of a colour) To decrease in saturation.
verb: (medicine) Of the oxygen saturation level in one's hemoglobin: to decrease, to drop.
verb: (medicine, of a person) To undergo a decrease in the oxygen saturation level in the hemoglobin.

(Definitions from Wiktionary)