Definition of "knuckleballer" []

• A knuckleball. (noun)
• A baseball pitcher that throws a knuckleball (noun)

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• "The knuckleballer is a candidate to be left off the postseason roster, joining Manny Delcarmen."
• "Wakefield, Boston's 45-year-old knuckleballer, is stalled in his pursuit of his 200th career victory."
• "The knuckleballer failed to retire any of the five batters he faced in Saturday's start against the Rockies."