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Meaning of double quatrefoil

dou'ble quat'refoil

Pronunciation: [key]
— Heraldry. Heraldry.
  1. a charge having the form of a foil with eight leaves, used esp. as the cadency mark of a ninth son. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.