ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
1. : a shrub of the genus Spiraea ; especially : a No. American native or naturalized plant of this genus (as S. alba or S. tomentosa )
2. : a plant of a genus ( Filipendula ) that is closely related to Spiraea ; especially : a tall perennial Eurasian herb ( F. ulmaria ) that is sometimes cultivated for its single or double cymose white flowers