Purr

v. i. & t.	1.	To murmur as a cat. See Pur.
n.	1.	The low murmuring sound made by a cat; pur. See Pur.

Noun	1.	purr - a low vibrating sound typical of a contented cat
Verb	1.	purr - make a soft swishing sound; "the motor whirred"; "the car engine purred" Synonyms: birr, whir, whirr, whiz, whizz
	2.	purr - indicate pleasure by purring; characteristic of cats Synonyms: make vibrant sounds

be in heaven, be pleased, beam, birr, bombilate, bombinate, boom, bum, burr, buzz, delight, die with delight, drone, feel happy, go into raptures, hum, joy, laugh, sing, smile, take great satisfaction, thrum, tread on air, whir, whiz