WordWeb Online

1. Running or extending in the direction of the length of a thing
   "the lengthways dimension";
   - lengthwise

1. In the direction of the length
   "He cut the paper lengthways";
   - lengthwise, longwise, longways, longitudinally, endlong [archaic]

See also: axial, end-to-end, fore-and-aft, linear, longitudinal, running