noun
definition
The underneath surface; the bottom, or underside
Examples of undersurface in a Sentence
The full-size has Frise ailerons, where the visible chord on the undersurface is significantly greater than on the top surface.
Similarly imbricated epidermic productions form the covering of the undersurface of the tail of the African flying rodents of the family Anomaluridae; and flat scutes, with the edges in apposition, and not overlaid, clothe both surfaces of the tail of the beaver, rats and certain other members of the rodent order, and also of some insectivora and marsupials.
The mucosa lining the cheeks, undersurface of the tongue and lips is quite thin and delicate.
Have a good look on the undersurface of the leaves for any of these tell-tale signs.