ˌdekəˈsāshən, ˌdēk- noun
( -s )
Etymology: Latin decussation-, decussatio, from decussatus + -ion-, -io -ion
1. : an intersection especially in the form of an X
the decussation of lines
2. botany : the quality or state of being decussate
3.
a. : a band of nerve fibers that connects unlike centers of opposite sides of the central nervous system
b. : a crossed tract of nerve fibers passing between centers on opposite sides of the central nervous system : commissure