surd

surd
[səːd]
adjective
  1. (Mathematics)(of a number) irrational
    (数)不尽根的
  2. (Phonetics)(of a speech sound) uttered with the breath and not the voice (e.g. f, k, p, s, t)
    (语音)清音的(如f, k, p, s, t)
noun
  1. (Mathematics)a surd number, especially the irrational root of an integer
    (数)不尽根(尤指整数的不尽根)
  2. (Phonetics)a surd consonant
    (语音)清音
语源
  1. mid 16th cent.: from Latin surdus 'deaf, mute'; as a mathematical term, translating Greek (Euclid) alogos 'irrational, speechless', apparently via Arabic jiḏr aṣamm, literally 'deaf root'. Sense 2 dates from the mid 18th cent
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