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The Collaborative International Dictionary of English v.0.48 (gcide)

Hairbreadth \Hair"breadth`\ (-br[e^]dth), Hair's breadth
\Hair's" breadth`\ (h[^a]rz"-).
The diameter or breadth of a hair; a very small distance;
sometimes, definitely, the forty-eighth part of an inch.
[Also spelled {hairsbreadth}.]
[1913 Webster]

Every one could sling stones at an hairbreadth and not
miss. --Judg. xx.
16.
[1913 Webster]