flatwise

[ flat-wahyz ]
/ ˈflætˌwaɪz /
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adverb

with the flat side, rather than the edge, foremost or in contact.
Also flat·ways [flat-weyz] /ˈflætˌweɪz/.

Origin of flatwise

First recorded in 1595–1605; flat1 + -wise
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for flatwise

  • Placing it flatwise on supports close to its ends we find that its own weight causes a decided sag.

    Inventors at Work|George Iles