"Surdal" is a word in ENGLISH

The art of calculating with any species of notation; as, the algorithms of fractions, proportions, surds, etc.

An elementary sound produced by the breath alone; a surd, or nonvocal consonant; as, f, th in thin, etc.

Destitute of tone vocality; surd.

An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a …

Not capable of being exactly expressed by an integral number, or by a vulgar fraction; surd; -- said especially of …

Uttered in a whisper, or with the breath alone, without voice, as certain consonants, such as p, k, t, f; …

Belonging to the class of sonant elements as distinguished from the surd, and considered as involving less force in utterance; …

Uttered, as an element of speech, with tone or proper vocal sound, as distinguished from mere breath sound; intonated; voiced; …

A term used differently by different authorities; -- by some as equivalent to fricative, -- that is, as including all …

Uttered, as an element of speech, without tone, or proper vocal sound; voiceless; unintonated; nonvocal; atonic; whispered; aspirated; sharp; hard, …

Unheard.

A quantity which can not be expressed by rational numbers; thus, Ã2 is a surd.

A surd element of speech. See Surd, a., 4.

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

Net having the sense of hearing; deaf.

One of the three surd mutes /, /, /; -- so called in relation to their respective middle letters, or …

Not sounded with voice; as, a voiceless consonant; surd.