De‐cus″sate (?), v. t. [imp. & p. p.Decussated; p. pr. & vb. n.Decussating.] [L. decussatus, p. p. of decussare to cross like an X, fr. decussis (orig. equiv. to decem asses) the number ten, which the Romans represented by X.] To cross at an acute angle; to cut or divide in the form of X; to intersect; — said of lines in geometrical figures, rays of light, nerves, etc.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.