Definition of rattlebones:
(n) :
A toy or instrument that makes a rattle sound; a rattle.
(n) :
An American herb (Crotalaria sagittalis), whose ripe seeds rattle in the inflated pod.
(n) :
Any species of Crotalaria, a genus of yellow-flowered herbs, with inflated, many-seeded pods.
(n) :
An ornamental shrub (Sesbania punicea) native to Brazil, Argentina, Paraguay and Uruguay.
(n) :
Any species of Rhinanthus, a genus of annual hemiparasitic herbaceous plants.
(n) :
Senna covesii, a perennial subshrub native to the United States and Mexico.