whirr
1. [ verb ] make a vibrant sound, as of some birds
Synonyms: churr
Related terms: utter
2. [ verb ] make a soft swishing sound, as of a motor working or wings flapping
Synonyms: whiz whir birr purr whizz
Related terms: go whir whiz
3. [ noun ] sound of something in rapid motion
Synonyms: whirring whir birr
Examples:

: "whir of a bird's wings" "the whir of the propellers"

Related terms: sound whizz
Similar spelling:   whir
  wherry
  whore
  where