I. ˈsnō-ˌbȯl noun
Date: 15th century
1.
a. : a round mass of snow pressed or rolled together
b. : snow cone
2. : any of several cultivated shrubby viburnums (genus Viburnum ) with clusters of white sterile flowers — called also snowball bush
II. verb
Date: 1843
intransitive verb
1. : to engage in throwing snowballs
2. : to increase, accumulate, expand, or multiply at a rapidly accelerating rate
transitive verb
1. : to throw snowballs at
2. : to cause to increase or multiply at a rapidly accelerating rate