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Definition of Saint Peter's wreath
1. Noun. Shrub having copious small white flowers in spring. 
Exact synonyms: Bridal Wreath, Bridal-wreath, Spiraea Prunifolia, St. Peter's Wreath
Generic synonyms: Spiraea, Spirea
Generic synonyms: Spiraea, Spirea
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1. Noun. Shrub having copious small white flowers in spring.