Full Definition of FACET. 1. : a small plane surface (as on a cut gem) â see brilliant illustration. 2. : any of the definable aspects that make up a subject (as of contemplation) or an object (as of consideration). 3. : the external corneal surface of an ommatidium.
Definition of cyanide. 1  1 : a compound of cyanogen with a more electropositive element or group: such asa : potassium cyanideb : sodium cyanide. 2  2 : cyanogen 1.
cyan. n. 1. (Colours) a highly saturated green-blue that is the complementary colour of red and forms, with magenta and yellow, a set of primary colours. adj. 2. (Colours) of this colour: a cyan filter.