before a vowel choris-, a. Gr. χῶρι, χωρίς asunder, apart: used in botanical terms, as Choripetalous a., having separate petals = POLYPETALOUS; Chorisantherous a., having separate anthers; Chorisepalous a., having separate sepals = POLYSEPALOUS.
1880. Gray, Struct. Bot., vi. § 5. 244. Choripetalous is … the most fitting name for a corolla the petals of which are separate.
