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

 

topsail

 noun
noun
BrE BrE//ˈtɒpseɪl//
 
; NAmE NAmE//ˈtɑːpseɪl//
 
; BrE BrE//ˈtɒpsl//
 
; NAmE NAmE//ˈtɑːpsl//
 
[usually singular] Parts of boats and ships, Travelling by boat or ship
 
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the sail attached to the upper part of the mast of a ship See related entries: Parts of boats and ships, Travelling by boat or ship
See the Oxford Advanced American Dictionary entry: topsail