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Noun
jumping bean
jumping seed
Mexican jumping bean
Definition: seed of Mexican shrubs of the genus Sebastiana containing the larva of a moth whose movements cause the bean to jerk or tumble
Definition: A type of seed of a shrub of the genus Sebastiania in which a larva has hatched from an egg laid there by a moth (Cydia deshaisiana, the movement of the larva causing the seed to move around.