cleft (adj.)

https://doi.org/10.1351/goldbook.10532
Split, divided, or partly divided into two.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 737 (https://doi.org/10.1515/pac-2015-1202)