Decussately

de·cus·sate  (d-kst, dk-st)

tr. & intr.v. de·cus·sat·ed, de·cus·sat·ing, de·cus·sates

To cross or become crossed so as to form an X; intersect.

adj.

1. Intersected or crossed in the form of an X.

2. Botany Arranged on a stem in opposite pairs at right angles to those above or below, resulting in four vertical rows: decussate leaves.

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[Latin decussre, decusst-, from decussis, the number ten, intersection of two lines (from the Romans' use of X for the numeral 10), a ten-as coin : decem, ten; see dek in Indo-European roots + assis, as (coin).]

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de·cussately adv.