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Noun: fractional rig
  1. A rig on a sailing vessel that consists of a foresail, such as a jib or genoa sail, that does not reach all the way to the top of the mast.
    "Fractional rigs were introduced on race boats in order to allow more controllability of the surface of the main sail and also less drag during tacking."

Type of: rig, rigging

Encyclopedia: Fractional rig