Definition of whitewall:
(adj) :
Having white sidewalls (of a tyre/tire)
(n) :
A tyre/tire with white sidewalls.
(adj) :
(US, military) Describing a hair cut with a closely cropped back and sides and the hair on the top of the head left longer.
(n) :
(US, military) A hair cut with a closely cropped back and sides and the hair on the top of the head left longer.
(n) :
(UK, dialect, Northamptonshire, rare) The spotted flycatcher.