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Meaning of buckstay

buck•stay

Pronunciation: (buk'stā"), [key]
— n.
  1. a beam held by stays to the exterior of a masonry wall, as that of a furnace or boiler, to keep the adjacent areas of the wall from being forced outward.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.