Surd

1.

A quantity which can not be expressed by rational numbers; thus, 2 is a surd.

2.

A surd element of speech.

1.

Net having the sense of hearing; deaf.

2.

Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number.

3.

Uttered, as an element of speech, without tone, or proper vocal sound; voiceless; unintonated; nonvocal; atonic; whispered; aspirated; sharp; hard, as f, p, s, etc.; -- opposed to sonant.

1.

Unheard