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treeseed commented on the word mexican jumping bean
Also called simply "jumping bean"
Merriam-Webster Dictionary:
Date: circa 1889
: a seed of any of several Mexican shrubs (genera Sebastiania and Sapium) of the spurge family that tumbles about because of the movements of the larva of a small tortricid moth (Cydia saltitans syn. Laspeyresia saltitans) inside it
January 27, 2008