What does "flatwise" mean?

With a flat side down or otherwise in contact with a flat surface.

What is a synonym for "flatwise"?

Common synonyms include: evenly, flat, flush, lengthwise, level.

adv

adv ·Rare ·Advanced level

Adverb

1
With a flat side down or otherwise in contact with a flat surface. not-comparable

From flat + -wise.