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Definition of Mainsail
1. Noun. The lowermost sail on the mainmast.
Definition of Mainsail
1. n. The principal sail in a ship or other vessel.
Definition of Mainsail
1. Noun. (nautical) The largest (or only) sail on a sailing vessel. ¹
¹ Source: wiktionary.com
Definition of Mainsail
1. the principal sail of a vessel [n -S]