lengthwise

from WordNet (r) 3.0 (2006)

lengthwise
    adv 1: in the direction of the length; "He cut the paper
           lengthwise" [syn: {lengthways}, {lengthwise}, {longwise},
           {longways}, {longitudinally}]
    adj 1: running or extending in the direction of the length of a
           thing; "the lengthwise dimension" [syn: {lengthwise},
           {lengthways}] [ant: {crosswise}]

from The Collaborative International Dictionary of English v.0.48

Lengthways \Length"ways`\ (-w[=a]z`), Lengthwise \Length"wise`\
   (-w[imac]z`), adv.
   In the direction of the length; running or extending in the
   direction of the length of a thing; in a longitudinal
   direction. Contrasted with {crosswise}.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

20 Moby Thesaurus words for "lengthwise":
      along, at full length, at length, endlong, endways, endwise,
      evenly, flat, flatly, flatways, flatwise, flush, horizontally,
      in length, lengthways, level, longitudinally, longways, longwise,
      on a level

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