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Definition of mainsail noun from the Oxford Advanced Learner's Dictionary

mainsail

noun

/ˈmeɪnseɪl/,

/ˈmeɪnsl/

/ˈmeɪnseɪl/,

/ˈmeɪnsl/

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the largest and most important sail on a boat or shipTopics Transport by waterc2

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See mainsail in the Oxford Advanced American Dictionary

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