Ninebark definitions

nīn'bärk'
Any of several shrubs of the genus Physocarpus of the rose family, especially P. opulifolius of eastern North America, having peeling or shredding bark and clusters of small white flowers.
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Any flowering plant of the genus Physocarpus.
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Origin of ninebark

nine +"Ž bark, because the bark separates into many thin layers.