Definition of Japanese snowball
1a
: a handsome cultivated shrub (Viburnum plicatum) with large globose clusters of sterile flowers very similar to those of the guelder rose
b
: the flower cluster of the Japanese snowball
2
or less commonly Japanese snowbell
: a deciduous shrub or small tree (Styrax japonica) having flowers in short glabrous racemes
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Merriam-Webster unabridged
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