| Adj. | 1. | lengthwise - running or extending in the direction of the length of a thing; "the lengthwise dimension" Synonyms: lengthways Antonyms: crosswise - lying or extending across the length of a thing or in a cross direction; "a crosswise street"; "the crosswise dimension" |
| Adv. | 1. | lengthwise - in the direction of the length; "He cut the paper lengthwise" |