'Forestay' definitions:

Definition of 'forestay'

From: WordNet
noun
An adjustable stay from the foremast to the deck or bowsprit; controls the bending of the mast

Definition of 'Forestay'

From: GCIDE
  • Forestay \Fore"stay`\, n. (Naut.) A large, strong rope, reaching from the foremast head to the bowsprit, to support the mast. See Illust. under Ship. [1913 Webster]