Rat"tle*box` (-b&obreve;ks`), n. 1. A toy that makes a rattling sound; a rattle.

2. (Bot.) (a) An American herb (Crotalaria sagittalis), the seeds of which, when ripe, rattle in the inflated pod. (b) Any species of Crotalaria, a genus of yellow-flowered herbs, with inflated, many-seeded pods.