An American herb (Crotalaria sagittalis), the seeds of which, when ripe, rattle in the inflated pod.

Any species of Crotalaria, a genus of yellow-flowered herbs, with inflated, many-seeded pods.

any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops

A toy that makes a rattling sound; a rattle.