widthwise

/W IH1 D TH W AY0 Z/
adjective
  1. 1

    Directed across the width of an object or place.

    โ€œMake a widthwise cut.โ€

adverb
  1. 1

    Across the width of an object or place.

    โ€œThe tubes should be placed widthwise inside the box.โ€

Source: https://en.wiktionary.org/wiki/widthwise