Of a cat, make a soft, continuous, vibrating sound

• Usually expressing comfort, contentment, or affection

Speak in a low, throaty, seductive or affectionate manner

• Sounding pleased or indulgent

Of a machine or engine, run with a low, smooth rumble

The soft, vibrating sound a cat makes

• Also, a similar murmurous sound of pleasure

Onomatopoeia imitating the sound of a cat’s purr