"having sharp outlines," 1821, figurative past participle adjective from chisel (v.).
early 14c., from Anglo-French cisel, Old French cisel "chisel," in plural, "scissors, shears" (12c., Modern French ciseau), from Vulgar Latin *cisellum "cutting tool," from Latin caesellum, diminutive of caesus, past participle of caedere "to cut" (see -cide). Related: Chiseled; chiseling.