Pronunciation: (krō'kus),[key] —n., —pl.-cus•es. 1. any of the small, bulbous plants of the genus Crocus, of the iris family, cultivated for their showy, solitary flowers, which are among the first to bloom in the spring.
2. the flower or bulb of the crocus.
3. a deep yellow; orangish yellow; saffron.
4. Also calledcro'cus mar'tisPronunciation: (mär'tis).[key]a polishing powder consisting of iron oxide.