Definition of fusee
1
: a conical spirally grooved pulley in a timepiece from which a cord or chain unwinds onto a cylinder containing the mainspring and which by its increasing diameter compensates for the lessening power of the spring
2
: a red signal flare used especially for protecting stalled trains and trucks
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Merriam-Webster unabridged
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Time Traveler for fusee
The first known use of fusee was in 1622
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