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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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  1. the largest and most important sail on a boat or shipTopics Transport by waterc2
See mainsail in the Oxford Advanced American Dictionary
valid
adjective
 
 
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