What does the word snowball mean?

Usage examples for snowball

  1. If he had been really a brave boy, he would have said, Henry, do you suppose that I am so foolish as to throw that snowball, just because you want to have me? – McGuffey's Third Eclectic Reader by William Holmes McGuffey
  2. And you can help find Snowball when she gets lost again. – Uncle Wiggily's Travels by Howard R. Garis