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.
Organic Chemistry/Alkenes/Cycloalkenes - Cycloalkenes. 1  A cycloalkene (also sometimes called a cycloolefin) is a type of alkene hydrocarbon which contains a closed ring of carbon atoms. The prefix cyclo- comes from ancient Greek and in this case means round.