flatwise

flat·wise

 (flăt′wīz′) also flat·ways (-wāz′)
adv.
With the flat side down or in contact with a surface.

flat•wise

(ˈflætˌwaɪz)

also flat•ways

(-ˌweɪz)

adv.
with the flat side, rather than the edge, foremost or in contact.
[1595–1605]
References in classic literature ?
Then straightway large-eyed queenly Hera prayed, striking the ground flatwise with her hand, and speaking thus:
Investigation of the anisotropy of creep deformation has indicated that a wood-PVC composite loaded in the flatwise direction produces less time-dependent deformation than in the edgewise direction [10].
Step 2: Take PIO computer out of the package, put it face down flatwise on the operating table.
Two international standards, ISO 179 and 180, allow for seven types of specimens, three different notch shapes, and three methods of striking the sample--Izod, Charpy flatwise, and Charpy edgewise.
Also at Varbola, the stove ends were supported by walls of flatwise laid granite stones and limestone slabs (T6nisson 1981, 49).
ISO 75-1 allows the testing of specimens in both the "edgewise" and "flatwise" directions--13 options for testing in the edgewise direction and five options for testing in the flatwise direction.
Through-thickness, flatwise tensile test composite specimens were tested per ASTM D7291-07 (23).
By contrast, ISO permits 13 depths tested edgewise and five depths tested flatwise, and each depth has a different point.
A rectangular 80 by 10 by 4 to 6-mm specimen was prepared, and the impact strength in the flatwise direction was measured with five unnotched sample replicates.
The specimen buildup consists of two flatwise bonded scantlings, with dimensions and test setup as shown in Figure 1.