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WordReference Random House Unabridged Dictionary of American English © 2024ep•i•phyl•lum (ep′ə fil′əm),USA pronunciation n. - Plant Biologyany of several mostly epiphytic cacti of the genus Epiphyllum, native to tropical America, having large, fragrant white flowers. Also called orchid cactus.
- Neo-Latin, equivalent. to Greek epi- epi- + Greek phýllon leaf; so called from the leaflike branches on which the flower grows
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