Noun spitball has 2 senses
  1. spitball - a projectile made by chewing a piece of paper and shaping it into a sphere
    --1 is a kind of
    projectile, missile
  2. spitball, spitter - an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it
    --2 is a kind of pitch, delivery
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