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Entry 6 senses · 2 variants Webster, 1913

Surd

/sûrd/ · IPA /sɜːd/
01 a. Net having the sense of hearing; deaf.
  1. 1.
    Net having the sense of hearing; deaf.[Obs.]
  2. 2.
    Unheard.[Obs.]
  3. 3.
    Involving surds; not capable of being expressed in rational numbers; radical; irrational; as, a surd expression or quantity; a surd number.(Math.)
  4. 4.
    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.(Phonetics)
02 n. A quantity which can not be expressed by rational numbers; thus, √2 is a surd.
  1. 1.
    A quantity which can not be expressed by rational numbers; thus, √2 is a surd.(Math.)
  2. 2.
    A surd element of speech. See Surd, a., 4.(Phon.) See: Surd