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Webster's Dictionary (1865)

Foil'ing, n.

noun

n. [Fr. foulées. See FOIL, v. t.]

  1. (Hunting.) The slight mark of a passing deer on the grass. Chalmers.
  2. (Arch.) A foil. Simmonds.
A decorative quatrefoil ornament with a four-lobed central shape.
A pointed Gothic-style arch with a smaller cusped opening inside it.