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Noun1.main-topsail - a topsail set on the mainmastmain-topsail - a topsail set on the mainmast  
sail, canvass, canvas, sheet - a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
References in classic literature ?
Sud denly her main-topsail went, yard and all, in a ter rific squall; she had to bear up under bare poles, and disappeared.