surd

(sûrd)
n.

1. Mathematics. An irrational number, such as √2.
2. Linguistics. A voiceless sound in speech.

adj. Linguistics
Voiceless, as a sound.

[Medieval Latin surdus, speechless, surd (translation of Arabic (jad̠r) 'aṣamm, deaf (root), surd , translation of Greek alogos, speechless, surd), from Latin.]

[fr. L. surdus, speechless]
1) Math.  irrational; fig. : lacking sense: irrational
2) Linguistic  voiceless, used of speech sounds

Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: a consonant produced without sound from the vocal cords
  Synonym: voiceless consonant

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The adjective surd has one meaning:

Meaning #1: (linguistics) of speech sounds
  Synonyms: voiceless, unvoiced
  Antonym: sonant (meaning #1)

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