Definition of "playfellow"

From this time Elizabeth Lavenza became my playfellow, and, as we grew older, my friend.

1818, [Mary Shelley], chapter I, in Frankenstein; or, The Modern Prometheus. […], volume I, London: […] [Macdonald and Son] for Lackington, Hughes, Harding, Mavor, & Jones, page 46

"Linton is just six months younger than I am," […] "How delightful it will be to have him for a playfellow!"

1847 December, Ellis Bell [pseudonym; Emily Brontë], chapter V, in Wuthering Heights: […], volume II, London: Thomas Cautley Newby, […], page 101

Now she was within ten feet of the two unsuspecting little playfellows—carefully she drew her hind feet well up beneath her body, the great muscles rolling under the beautiful skin.

1912 October, Edgar Rice Burroughs, “Tarzan of the Apes”, in The All-Story, New York, N.Y.: Frank A. Munsey Co.; republished as “The White Ape”, in Tarzan of the Apes, New York, N.Y.: A. L. Burt Company, 1914 June, page 59

"I’ve brought you a new playfellow," the Fairy said. "You must be very kind to him and teach him all he needs to know in Rabbitland, for he is going to live with you for ever and ever!"

1921 June, Margery Williams, “The Velveteen Rabbit: Or How Toys Become Real”, in Harper’s Bazar, volume LVI, number 6 (2504 overall), New York, N.Y.: International Magazine Company, page 110