Definition of Japanese snowball
1 a
: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
Writing? Check your grammar now!