purr

1. The vibrating sound made by a cat in its throat when contented.
2. A throaty, seductive sound of pleasure made by a person.
3. The low consistent rumble made by an engine at slow speed

1. Of a cat, to make a vibrating sound in its throat when contented.
2. To say (something) in a throaty, seductive manner.
3. To make a vibrating throaty sound, as from pleasure.

   He purred like a kitten when she massaged his neck.

4. (of an engine) To make a low and consistent rumbling sound.

interjection

Throat vibrating sound made by a cat.