passion flower noun
1. Any flower or plant of the genus Passiflora, consisting mostly of climbers of tropical and warm temperate America, from a fancied resemblance of parts of the flower to the crown of thorns, nails, and other emblems of Christ's Passion
2. The plant itself
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Main Entry: ↑passion
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a tropical climbing plant with large brightly coloured flowers
Useful english dictionary. 2012.