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From The Collaborative International Dictionary of English v.0.48:
Whiz \Whiz\, v. i. [imp. & p. p. Whizzed; p. pr. & vb. n. Whizzing.] [Of imitative origin. ???. Cf. Whistle, and Hiss.] To make a humming or hissing sound, like an arrow or ball flying through the air; to fly or move swiftly with a sharp hissing or whistling sound. [Written also whizz.] [1913 Webster] It flew, and whizzing, cut the liquid way. --Dryden. [1913 Webster]