Definitions for jumping bean
Random House Webster's College Dictionary
the seed of any of certain Mexican plants of the genera Sebastiania and Sapium, of the spurge family: the movements of a moth larva inside the seed cause it to move about or jump.
Origin of jumping bean:
jumping bean, jumping seed, Mexican jumping bean(noun)
seed of Mexican shrubs of the genus Sebastiana containing the larva of a moth whose movements cause the bean to jerk or tumble
A Mexican jumping bean.
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