Simple Definition of mainsail

from our Learner's Dictionary

mainsail

noun

ˈmeɪnˌseɪl How to pronounce mainsail (audio) ˈmeɪnsəl How to pronounce mainsail (audio)
plural mainsails
: the largest sail of a sailing ship

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“Mainsail.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/mainsail. Accessed 16 Apr. 2026.

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