cabochonPronunciation: /ˈkabəʃɒn/Definition of cabochon noun a gem that has been polished but not faceted: two big ruby cabochons [as modifier]:a necklace of cabochon rubiesPhrases en cabochon (of a gem) polished but not faceted: precious stones en cabochonOrigin: mid 16th century: from French, diminutive of caboche 'head'cabochon in other Oxford dictionaries Definition of cabochon in the US English dictionary