Meaning of brigsail

brig•sail

Pronunciation: (brig'sāl"Naut.brig's&schwal), [key]
— n. Naut.
  1. a large gaffsail on the mainmast or trysail mast of a brig.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.