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
Origin and Etymology of fusee
French fusée, literally, spindleful of yarn, from Old French, from fus spindle, from Latin fusus
First Known Use: 1622
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