Meaning of SURD in English

SURD

[ sə:d ]

■ noun

1》 Mathematics an irrational number.

2》 Phonetics a speech sound uttered with the breath and not the voice (e.g. f , k , p ).

Origin

C16 (as adjective): from L. ~us 'deaf, mute'; as a mathematical term, translating Gk alogos 'irrational, speechless'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.