Decorated with or having the shape of a cinquefoil; possessing five lobes or divisions.
From cinquefoil + -ed (adjective-forming suffix). Used in heraldic and architectural descriptions to indicate something featuring the five-lobed cinquefoil shape.
When you see 'cinquefoiled' in architectural descriptions, architects are saying 'this door/window/decoration has that medieval five-leaf design'—it's the heraldry shorthand that never died.
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