不ふ尽じん根こん数すう

noun

surd; irrational root

A mathematical term for an irrational root expressed with a radical sign, such as √2. Used in algebra and number theory.

• √2は不ふ尽じん根ね数すうの一いち例れいです。

  √2 is an example of a surd.

• 不ふ尽じん根こん数すうを有ゆう理り化かする方ほう法ほうを学まなんだ。

  I learned how to rationalize a surd.