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cinquefoil (n.)

in architecture, an ornament consisting of five cuspidated divisions, late 15c., from Latin quinquefolium, from quinque (from PIE root *penkwe- "five") + folium "leaf" (from PIE root *bhel- (3) "to thrive, bloom"). As the name of a plant with compound leaves of five leaflets, 1540s.

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Definitions of cinquefoil from WordNet

cinquefoil (n.)
any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties;
Synonyms: five-finger
cinquefoil (n.)
an ornamental carving consisting of five arcs arranged in a circle;
From wordnet.princeton.edu