Definition of "four-seamer" [four-seamer]

• A four-seam fastball. (noun)

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• "The strikeouts came, in order, on a curve (looking), a 98-mph four-seamer (swinging) and a 96-mph two-seamer (swinging)."
• ""He used to be really a four-seamer, cutter inside or third-base side, and then curveball," Mr. Girardi said."
• "Pitching coach John Farrell says Matsuzaka refined the mix of his wide assortment of pitches, mostly ditching his splitter in favor of a straight changeup and relying more on his two-seam fastball, four-seamer and cutter."