whisk·er / ˈ(h)wiskər/ • n. 1. a long projecting hair or bristle growing from the face or snout of many mammals. ∎ (whiskers) the hair growing on a man's face, esp. on his cheeks. ∎ a single crystal of a material in the form of a filament with no dislocations. 2. (a whisker) inf. a very small amount: they won the election by a whisker. 3. a spar for extending the clews of a sail so that it can catch more wind. PHRASES: within a whisker of inf. extremely close or near to doing, achieving, or suffering something.DERIVATIVES: whiskered adj.whiskery adj.