whiz

Onomatopoeic. Compare huzz, hizz, hiss.

In some noun senses perhaps derived from wizard. In the sense “remarkably skilled person”, it may also simply a misspelling of its shortened form wiz, or it may be a shortening of whiz kid, which may have a different origin, perhaps whiz(z) in the sense of “something very remarkable”, attested from 1908, or the interjection (as in whizz-bang or gee whiz).

In fact, whiz(z) in the sense of “something very remarkable” may be derived from whizz-bang in the sense of “conspicuously talented”, and in military slang whizz-bang (or whizbang) can mean “an exceptionally skilful person” (attested in 1916 and later), which whiz in the same sense seems to be a shortening of (whence presumably also whiz kid).

See with.