Source : Webster's Revised Unabridged Dictionary (1913)

Crosswise \Cross"wise`\ (-w?z`), adv.
   In the form of a cross; across; transversely. --Longfellow.

Source : WordNet®

crosswise
     adj 1: lying or extending across the length of a thing or in a
            cross direction; "a crosswise street"; "the crosswise
            dimension" [ant: {lengthwise}]
     2: in the shape of (a horizontal piece on) a cross
     adv 1: not in the intended manner; "things are going crosswise"
     2: transversely; "the marble slabs were cut across" [syn: {across},
         {crossways}]