Surd

Surd

(1):

(n.) A surd element of speech. See Surd, a., 4.

(2):

(a.) 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. See Guide to Pronunciation, //169, 179, 180.

(3):

(a.) Net having the sense of hearing; deaf.

(4):

(a.) Unheard.

(5):

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

(6):

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