"spirea" in the noun sense
1. spirea, spiraea, Astilbe japonica
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
2. spirea, spiraea
any rosaceous plant of the genus Spiraea has sprays of small white or pink flowers
Source: WordNet® (An amazing lexical database of English)
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