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bitchy (adj.): 1925, U.S. slang, "sexually provocative;" later (1930s) "spiteful, catty, bad-tempered" (usually of females); from bitch + -y (2). Earlier in reference to male dogs though to look less rough or coarse than usual.
Mr. Ramsay says we would now call the old dogs "bitchy" in face. That is because the Englishmen have gone in for the wrong sort of forefaces in their dogs, beginning with the days when Meersbrook Bristles and his type swept the judges off their feet and whiskers and an exaggerated face were called for in other varieties of terriers besides the wire haired fox. [James Watson, "The Dog Book," New York, 1906]
Related: Bitchily; bitchiness.
bristle (v.): c. 1200 (implied in past participle adjective bristled) "set or covered with bristles," from bristle (n.). Meaning "become angry or excited" is 1540s, from the way animals show fight. Related: Bristling.
horror (n.): early 14c., from Old French horror (12c., Modern French horreur) and directly from Latin horror "dread, veneration, religious awe," a figurative use, literally "a shaking, trembling, shudder, chill," from horrere "to bristle with fear, shudder," from PIE root *ghers- "to bristle" (cognates: Sanskrit harsate "bristles," Avestan zarshayamna- "ruffling one's feathers," Latin eris (genitive) "hedgehog," Welsh garw "rough"). As a genre in film, 1934. Chamber of horrors originally (1849) was a gallery of notorious criminals in Madame Tussaud's wax exhibition.
hyena (n.): mid-14c., from Old French hiene, from Latin hyaena, from Greek hyaina "swine" (fem.), from hys "pig" + fem. suffix -aina. So called for its bristles. Applied to cruel, treacherous, and greedy persons since at least 1670s. Adjectival forms that have been attempted in English include hyenaish, hyenaesque, hyenic, hyenine.
stubble (n.): c. 1300, "stumps of grain stalks left in the ground after reaping," from Old French estuble "stubble" (Modern French éteule), from Vulgar Latin stupla, reduced form of Latin stipula "stalk, straw" (see stipule). Applied from 1590s to bristles on a man's unshaven face.
setose: "Bearing bristles or setae; bristly", Mid 17th century: from Latin seta 'bristle' + -ose¹.
achaetous: "Having no bristles; not bearing chaetae", Late 19th cent.; earliest use found in Adam Sedgwick (1854–1913), zoologist. From a- + chaeta + -ous.
hispid: "Covered with stiff hair or bristles", Mid 17th century: from Latin hispidus.
acrostichal: "Of the bristles on the mesothorax of some dipteran flies: arranged in rows on the dorsal part of this (the mesonotum)", Late 19th cent. From acro- + ancient Greek στίχος row, line + -al, after German acrostichal.