- (a.) Unheard.
- (a.) Net having the sense of hearing; deaf.
- (a.) Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number.
- (n.) A surd element of speech. See Surd, a., 4.
- (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.
- (n.) A quantity which can not be expressed by rational numbers; thus, Ã2 is a surd.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). surd. Retrieved September 21, 2026, from http://smartdefine.org/surd/definitions/2068967 |
| Chicago | Webster's. 2011. "surd" http://smartdefine.org/surd/definitions/2068967 (accessed September 21, 2026). |
| Harvard | Webster's 2011, surd, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/surd/definitions/2068967>. |
| MLA | Webster's. "surd" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/surd/definitions/2068967> |