quatrefoil noun. ['katrǝfɔɪl, 'kwɒtrǝ-] LME.
[Anglo-Norman, from Old & mod. French quatre four + foil leaf, FOIL noun¹.]
1. A set of four leaves. rare. Only in LME.

2. A leaf or flower consisting of four (usu. rounded) leaflets or petals radiating from a common centre; a representation or imitation of this, esp. as a charge in heraldry; Architecture an opening or ornament having an outline divided by cusps so as to give the appearance of such a leaf or flower, esp. a clover leaf. L15.

■ quatrefoiled adjective (Architecture) having the form of a quatrefoil, divided into four parts by cusps M19.

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