dĕcusso, āvi, ātum, 1, v. a. [decussis, no. I.],
to divide crosswise , in the form of an X, to decussate , * Cic. Univ. 7 med. ; Col. 3, 13, 12; 4, 17, 6 al.
decussō āvī, ātus, āre decussis (decem + as), a coin stamped with X, to divide crosswise (in the f...
An Elementary Latin Dictionary