Definition of "ghostball" []

• A type of pitch; the knuckleball. (noun)

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• "The "hairy ghostball" that's "looking at you" grossed me out the most, mainly because I have eaten one of those."
• "Potting balls is easy with a real ghostball but if I try to visualise one instead I frequently miss my target."
• "Why is it so much harder to line up the que with the imaginary ghostball?"