noun
mainsail
MAYN-sayl
noun
1
The largest sail on a sailboat, set on the main mast.
"The crew hauled up the mainsail as the wind picked up."
How to Use Mainsail
Learner’s notesIn plain EnglishThe principal sail of a sailing boat, attached to the main mast.
Word Forms
mainsails plural
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The crew hauled up the _____ as the wind picked up.
Etymology
From main + sail.