緩かん球きゅうかんきゅうMeanings1nounslow ball; slow pitchbaseballBaseball term for a pitch thrown with reduced speed, often used to disrupt the batter's timing.投とう手しゅは緩かん球きゅうを投なげて打だ者しゃのタイミングを外はずした。The pitcher threw a slow ball to throw off the batter's timing.