whiskerPronunciation: /ˈwɪskə/Translate whisker | into French | into German | into Italian | into Spanish Definition of whisker noun 1a long projecting hair or bristle growing from the face or snout of many mammals. (whiskers) the hair growing on a man’s face, especially on his cheeks. 2 (a whisker) informal a very small amount:they won the election by a whisker 3a single crystal of a material in the form of a filament with no dislocations. Phrases have (or have grown) whiskers informal (especially of a story) be very old. within a whisker of informal extremely close or near to doing, achieving, or suffering something:Jarvis came within a whisker of winning the gameDerivatives whiskered adjective whiskery adjective Origin: late Middle English (originally denoting a bundle of feathers, twigs, etc., used for whisking): from the verb whisk + -er1whisker in other Oxford dictionaries Definition of whisker in the US English dictionary