*decussate*

v. t. [ imp. & p. p. Decussated; p. pr. & vb. n. Decussating. ] [ L. decussatus, p. p. of decussare to cross like an X, fr. decussis (orig. equiv. to decem asses) the number ten, which the Romans represented by X. ] To cross at an acute angle; to cut or divide in the form of X; to intersect; -- said of lines in geometrical figures, rays of light, nerves, etc.