Definition of decussating:
(adj) :
Crossed; intersected; resembling a letter X.
(v) :
To form an X or to cross or intersect.
(adj) :
(zoology) Having anatomical structures or markings crossing each other, typically in an X shape or at right angles.
(adj) :
(botany) Having opposite leaves arranged alternately at right angles.
(adj) :
(rhetoric) Consisting of two rising and two falling clauses, placed in alternate opposition to each other.