#1 purr n. a low vibrating sound typical of a contented cat. wn
#2 purr v. [whizz, whiz, whirr, whir, birr] make a soft swishing sound; "the motor whirred"; "the car engine purred". wn
#3 purr v. [make vibrant sounds] indicate pleasure by purring; characteristic of cats. wn
vizzz