bris·tle 
(brĭsəl)
(brĭsəl)n.
1. A stiff hair.
2. A stiff hairlike structure: the bristles of a wire brush.
v. bris·tled, bris·tling, bris·tles
v.intr.
1. To stand stiffly on end like bristles: The hair on the dog's neck bristled.
2. To raise the bristles: The cat bristled at the sight of the large dog.
3. To react in an angry or offended manner: The author bristled at the suggestion of plagiarism.
4. To be covered or thick with or as if with bristles: The path bristled with thorns.
v.tr.
1. To cause to stand erect like bristles; stiffen.
2. To furnish or supply with bristles.
3. To make bristly; ruffle.
[Middle English bristel, probably from Old English *byrstel, from byrst, bristle.]