負ふ数すうふすうMeanings1nounnegative numbermathematicsMathematics term for a number less than zero. Often contrasted with 正数 (positive number).See also: 正数負ふ数すうはゼロより小ちいさい数かずです。A negative number is a number smaller than zero.この計けい算さんでは負ふ数すうが出でてきます。Negative numbers appear in this calculation.