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foliot

noun fo·li·ot \ ˈfōlēət \

Definition of foliot

plural -s
: the earliest form of mechanical-clock escapement consisting of a crossbar with adjustable weights for regulating the rate of oscillation of a verge or vertical spindle

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Origin and Etymology of foliot

French, from Middle French, probably from folier to play the fool, from fol foolish, mad

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