American Heritage® Dictionary of the English Language, Fourth
Edition - n. Mathematics An irrational number, such as √2. - n.
Linguistics A voiceless sound in speech. - adj. Linguistics
Voiceless, as a sound. Century Dictionary and Cyclopedia - Not
having the sense of hearing; deaf. - That cannot be
discriminated by the ear (?). - In mathematics, not capable of
being expressed in rational numbers: as, a surd expression,
quantity, or number. See II., 1. - In phonetics, uttered with
breath and not with voice; devoid of vocality; not sonant:
toneless: specifically applied to the breathed or non-vocal
consonants of the alphabet. See II., 2. - Meaningless;
senseless. - n. In mathematics, a quantity not expressible as
the ratio of two whole numbers, as √ 2, or the ratio of the
circumference of a circle to the diameter. The name surd arises
from a mistranslation into Latin of the Greek ἄλογος, which does
not mean ‘stupid’ or ‘unreasonable,’ but ‘inexpressible.’ - n.
In phonetics, a consonantal sound uttered with bre