A quality that cannot be expressed by rational numbers, as the square root of.

【数】无理数；不尽根(如2之方根)。

A consonant sound made with the breath but without voice, as f, p, s.

无声子音(如 f、p、s)。

Not capable of being expressed in rational numbers; involving surds.

【数】无理数的；不尽根的。

Uttered, as certain consonants, without voice or tone.

无声音的。