{i} any of a number of shrubs which belong to the rose family and bear clusters of white or pink flowers (also spirea)
spirea: any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers
spirea: a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming