Definition of lengthwise adverb from the Oxford Advanced American Dictionary

 

lengthwise

 adverb
adverb
NAmE//ˈlɛŋkθwaɪz//
 
, NAmE//ˈlɛŋθwaɪz//
 
(also lengthways
NAmE//ˈlɛŋkθweɪz//
 
, NAmE//ˈlɛŋθweɪz//
 
)
 
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in the same direction as the longest side of something Cut the banana in half lengthwise. compare widthwise
lengthwiseadjective
 
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a lengthwise cut