英语词汇knuckleball的发音释义、词根词缀、结构分析、同源词、词频及词根记忆法-英语词根词缀词典

词汇	knuckleball
词根词缀	Online Etymology Dictionary knuckleball n. also knuckle-ball, baseball pitch, by 1909, from knuckle, n. + ball, n.1. So called from the position of the fingers in throwing it. Related: Knuckleballer.
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