自じ乗じょう根こんじじょうこんMeanings1nounsquare rootmathematicsMathematical term for the square root of a number. Less common than 平方根 (へいほうこん) in modern usage, but still encountered in older or formal mathematical contexts.4の自じ乗じょう根こんは2である。The square root of 4 is 2.