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Related to maypop: maypop fruit
1. A passionflower (Passiflora incarnata) of the southeast United States having purple and white flowers, three-lobed leaves, and edible oval yellow fruit.
2. The fruit of this plant.
(Plants) dialect US a climbing wild flower, Passiflora incarnata, common in the southern USA and yielding an oval berry approximately the size of a hen's egg
1. the edible fruit of a passion flower.
[1850–55, Amer.; from maycock, perhaps < Virginia Algonquian]