decussate (n.), decussation (adj.)

https://doi.org/10.1351/goldbook.10592
Pertaining to two or more things that cross or intersect each other to form an X.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 742 [Terms] [Paper]