decussate (v.) Look up decussate at Dictionary.com
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" (from PIE root *dekm- "ten"). As an adjective, from 1825.