topsail

Definitions of topsail
  1. noun
    a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast
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    types:
    fore-topsail
    the topsail on a foremast
    type of:
    canvas, canvass, sail, sheet
    a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
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