adj. & v.
--adj.
1. X-shaped.
2 Bot. with pairs of opposite leaves etc. each at right angles to the pair below.
--v.tr. & intr.
1. arrange or be arranged in a decussate form.
2 intersect.
Derivatives:
decussation n.
Etymology: L decussatus past part. of decussare divide in a cross shape f. decussis the numeral ten or the shape X f. decem ten