'Lengthwise' definitions:

Definition of 'lengthwise'

adverb

In the direction of the length; "He cut the paper lengthwise" [syn: lengthways, lengthwise, longwise, longways, longitudinally]

adjective

Running or extending in the direction of the length of a thing; "the lengthwise dimension" [syn: lengthwise, lengthways] [ant: crosswise]

From: GCIDE

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]