##### The Collaborative International Dictionary

**Decussate**

Decussate \De*cus"sate\, 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.

**Decussate**

Decussate \De*cus"sate\, Decussated \De*cus"sa*ted\, a.

Crossed; intersected.

(Bot.) Growing in pairs, each of which is at right angles to the next pair above or below; as, decussated leaves or branches.

(Rhet.) Consisting of two rising and two falling clauses, placed in alternate opposition to each other; as, a decussated period.

##### Douglas Harper's Etymology Dictionary

**decussate**

1650s, from Latin *decussatus*, past participle of *decussare* "to divide crosswise, to cross in the form of an 'X,'" from *decussis* "the figure 'ten'" (in Roman numerals, represented by *X*) from *decem* "ten" (see ten). As an adjective, from 1825.

##### Wiktionary

**decussate**

1 Crossed; intersected; resembling a letter X. 2 (context botany English) Having opposite leaves arranged alternately at right angles. 3 (context rhetoric English) Consisting of two rising and two falling clauses, placed in alternate opposition to each other. v

To form an X or to cross or intersect.

##### WordNet

**decussate**

adj. crossed or intersected in the form of an X [syn: intersectant, intersecting]

v. cross or intersect so as to form a cross; "this nerve decussates the other"; "the fibers decussate"