Plural of fastball; pitches thrown at high speed with little arc in baseball and other sports.
Compound of 'fast' and 'ball,' formed as baseball terminology in the late 19th century. The '-s' makes it plural, and it's one of the fundamental terms in baseball vocabulary.
The fastball is the oldest baseball pitch—before curveballs were common, pure speed was the pitcher's main weapon, and the term reflects baseball's evolution!
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