D defs.my
Entry 1 sense Webster, 1913

Decussation

· De·cus·sa·tion · IPA /dɛkʌˈseɪʃən/
01 n. 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, nerve…
  1. 1.
    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.