Definitions for hairbreadthˈhɛərˌbrɛdθ, -ˌbrɛtθ
Random House Webster's College Dictionary
also hairsbreadth, 1
a very small space or distance:
to escape by a hairbreadth.
(adj.)extremely narrow or close:
a hairbreadth escape.
Origin of hairbreadth:
the width of a hair, a very short distance or a very small amount
Origin: From hair + breadth.
alt. of Hair'sbreadth
having the breadth of a hair; very narrow; as, a hairbreadth escape