Merriam-Webster Collegiate Dictionary - whiz

 I. verb  or ~z  (~zed; ~zing)  Etymology: imitative  Date: 1582  intransitive verb  1. to hum, whir, or hiss like a speeding object (as an arrow or ball) passing through air  2. to fly or move swiftly especially with a ~ cars ~zing by  transitive verb to cause to ~; especially to rotate very rapidly  II. noun  or ~z  (plural ~zes)  Date: 1620  1. a hissing, buzzing, or whirring sound  2. a movement or passage of something accompanied by a ~zing sound  3. sometimes vulgar an act of urinating — used especially in the phrase take a ~  III. noun  (plural ~zes)  Etymology: probably by shortening & alteration  Date: 1914 wizard 3 a math ~