the world > physical sensation > hearing and noise > degree, kind, or quality of sound > continuous or protracted sound > vibratory sound > [verb (intransitive)] > purr (2)
purr1657
In extended use. intransitive. Of a thing: to make a sound resembling a cat's purr, as that caused by rapid vibrations, boiling or bubbling liquid…
murr1807
intransitive. Of a cat: to purr. Also in extended use.