1. To cross. 2. Crossed like the arms of an X. [L. decusso, pp. -atus, to make in the form of an X, fr. decussis, a large, bronze Roman (2nd c. BC), 10-unit coin marked with an X to indicate its denomination]
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de·cus·sate 'dek-ə-.sāt, di-'kəs-.āt vb, -sat·ed; -sat·ing to intersect in the form of an X
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de·cus·sate (de-kusґāt) [L. decussare to cross in the form of an X] 1. to cross or intersect in the form of the letter X. 2. crossing in the form of the letter X.Medical dictionary. 2011.