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Meaning of topgallant forecastle

top•gal'lant fore"castle

Pronunciation: (top"gal'untNaut.tu&sylpgal'unt), [key]
— Naut. Naut.
  1. a partial weather deck on top of a forecastle superstructure; forecastle deck.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.