SURD (2)

Source: 566, 567

surd (2). Surd, n. an incommensurable number

---

Surd, n. (Math.) 1. 1. A quantity which can not be expressed by rational numbers; thus, √2 is a surd.
2. 2. (Phon.) A surd element of speech. See Surd, a., 4.