Mainsail

A mainsail is a sail rigged on the main mast of a sailing vessel. On a square rigged vessel, it is the lowest and largest sail on the main mast. On a fore-and-aft rigged vessel, it is the sail rigged aft of the main mast.

The sail's foot is normally attached to a boom..

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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