Definify.com

Webster 1913 Edition

Noun.

[L.

decussatio

Act of crossing at an acute angle, or state of being thus crossed; an intersection in the form of an X;

as, the

decussation

of lines, nerves, etc.

Noun.

The act of crossing at unequal angles; the crossing of two lines, rays or nerves, which meet in a point and then proceed and diverge.