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Meaning of main-topgallantmast

main-top•gal•lant•mast

Pronunciation: (mān'top-gal'unt-mast", -mäst"Naut.mān'tu-gal'unt-must), [key]
— n. Naut.
  1. the mast next above the main-topmast.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.