Meaning of main-topsail

main-top•sail

Pronunciation: (mān"top'sāl"Naut.mān"top's&schwal), [key]
— n. Naut.
  1. a topsail set on the mainmast. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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