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Adjective: lengthwise  'lengkth,wIz
  1. Running or extending in the direction of the length of a thing
    "the lengthwise dimension";
    - lengthways
Adverb: lengthwise  'lengkth,wIz
  1. In the direction of the length
    "He cut the paper lengthwise";
    - lengthways, longwise, longways, longitudinally, endlong [archaic]

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

Antonym: crosswise