Wiktionary
undersurfaces
n. (plural of undersurface English)
Usage examples of "undersurfaces".
He was also wearing the hide foot-sheaths taken from Bo, but he had removed the thick undersurfaces because they were clumsy and slipped on the rocks.
He could feel air against they undersurfaces in the same way the back pressure of the water on an oar can be felt by somebody rowing.
The trees on each bank were limned from above with silver from Neilson’s Star, and on their undersurfaces with gold from the machine’s powerful headlights, giving them a look of unreality.
They were gray, white on the undersurfaces, and the fore ones were very like tiny hands.