What is the meaning of whiz?

noun

• Someone who is dazzlingly skilled in any field.
  • synonyms: ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whizz, wizard, wiz
• A buzzing or hissing sound as of something traveling rapidly through the air.
  • usage: "he heard the whiz of bullets near his head"

verb

• Make a soft swishing sound.
  • usage: "the motor whirred"; "the car engine purred"
  • synonyms: whizz, whirr, whir, birr, purr