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surd    
a. 无理数的,不尽根的,清音的
n. 无理数,不尽根数,清音

无理数的,不尽根的,清音的无理数,不尽根数,清音

surd
adj 1: produced without vibration of the vocal cords; "unvoiced
consonants such as `p' and `k' and `s'" [synonym: {unvoiced},
{voiceless}, {surd}, {hard}] [ant: {soft}, {sonant},
{voiced}]
n 1: a consonant produced without sound from the vocal cords
[synonym: {surd}, {voiceless consonant}]

Surd \Surd\, n. (Math.)
1. A quantity which can not be expressed by rational numbers;
thus, [root]2 is a surd.
[1913 Webster]

2. (Phon.) A surd element of speech. See {Surd}, a., 4.
[1913 Webster]


Surd \Surd\, a. [L. surdus deaf (whence the meaning, deaf to
reason, irrational), perhaps akin to E. swart. Cf.
{Sordine}.]
1. Net having the sense of hearing; deaf. [Obs.] "A surd . .
. generation." --Sir T. Browne.
[1913 Webster]

2. Unheard. [Obs.] --Kenrick.
[1913 Webster]

3. (Math.) Involving surds; not capable of being expressed in
rational numbers; radical; irrational; as, a surd
expression or quantity; a surd number.
[1913 Webster]

4. (Phonetics) 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, [sect][sect]169, 179, 180.
[1913 Webster]

202 Moby Thesaurus words for "surd":
Gaussian integer, accented, algebraic number, algorismic,
algorithmic, aliquot, allophone, alveolar, apical, apico-alveolar,
apico-dental, articulated, articulation, aspiration, assimilated,
assimilation, back, barytone, bilabial, broad, cacuminal, cardinal,
cardinal number, central, cerebral, check, checked, close,
complex number, consonant, consonantal, continuant, deaf,
deaf and dumb, deaf-eared, deaf-mute, deafened, decimal,
defective number, dental, differential, digital, diphthong,
dissimilated, dissimilation, dorsal, dull-eared, earless,
epenthetic vowel, even, even number, explosive, exponential,
figural, figurate, figurative, finite, finite number, flat,
fraction, fractional, front, glide, glossal, glottal,
glottalization, guttural, hard, hard of hearing, heavy, high,
imaginary, imaginary number, impair, impossible, infinite,
infinity, integer, integral, intonated, irrational,
irrational number, labial, labialization, labiodental, labiovelar,
laryngeal, lateral, lax, light, lingual, liquid, logarithmic,
logometric, low, manner of articulation, mid, mixed number,
modification, monophthong, monophthongal, morphophoneme, mute,
muted, narrow, nasal, nasalized, negative, numeral, numerary,
numerative, numeric, occlusive, odd, open, ordinal, oxytone, pair,
palatal, palatalized, parasitic vowel, peak, pharyngeal,
pharyngealization, pharyngealized, phone, phoneme, phonemic,
phonetic, phonic, pitch, pitched, plosive, polygonal number,
positive, possible, posttonic, prime, prime number,
prothetic vowel, pure imaginary, radical, rational,
rational number, real, real number, reciprocal, rectangular number,
retroflex, round number, rounded, segmental phoneme, semivowel,
serial number, soft, sonant, sonority, speech sound, stone-deaf,
stop, stopped, stressed, strong, stunned, submultiple, syllabic,
syllabic nucleus, syllabic peak, syllable, tense, thick,
thick of hearing, throaty, tonal, tone-deaf, tonic, transcendental,
transcendental number, transfinite number, transition sound,
triphthong, twangy, unaccented, unhearing, unrounded, unstressed,
velar, vocable, vocalic, vocoid, voice, voiced, voiced sound,
voiceless, voiceless sound, voicing, vowel, vowellike, weak,
whole number, wide, word-deaf


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  • Surds - Math is Fun
    When we can't simplify a number to remove a square root (or cube root etc) then it is a surd Have a look at these examples (including cube
  • Surds and Indices - Definition, Types, Rules, and Practice . . . - Cuemath
    The Latin meaning of the word "Surd" is deaf or mute In earlier days, Arabian mathematicians called rational numbers and irrational numbers as audible and inaudible
  • Surd - Wikipedia
    Mathematics Surd (mathematics), an unresolved root or sum of roots Radical symbol, the notation for a root formerly, an irrational number in general
  • SURD Definition Meaning - Merriam-Webster
    Both surd and its more common cousin absurd come from the Latin word surdus, meaning "unhearing, deaf, muffled, or dull " Absurd traveled through Middle French before arriving in English in the early 16th century
  • Surds: Definition, Rules, Types, and Solved Examples
    A root of a positive real number is called a surd if we cannot remove the root symbol after simplification Examples of surds: Note that we cannot remove the root symbol from 2, 3; so by definition they are surds
  • Surds Definition Formula and Solved Examples - Vedantu
    What Is Surds? A surd is defined as an irrational root that cannot be expressed exactly as a fraction or terminating repeating decimal For example, numbers like √2, √7, or ∛5 are all surds because their decimal expansions are non-terminating and non-recurring
  • Surds Calculator
    How to Use the Surds Calculator Enter your surd in the input field (e g , √18) Select the operation you want to perform (simplify, add, subtract, multiply, or divide) If performing operations between two surds, enter the second surd Click “Calculate” to see the result Understanding Surd Simplification
  • Summer Undergraduate Research Diversity Program (SURD) | College of . . .
    The UC Berkeley College of Chemistry is thrilled to announce its 2026 Summer Undergraduate Research Diversity (SURD) program for undergraduate students interested in Chemistry, Chemical Biology and or Chemical Biomolecular Engineering
  • Surds - An Introduction - Irrational Numbers and Rules - Laerd
    Well, 2 x 121 is 242 and we can take the square root of 121 without leaving a surd (because we get 11) Since we cannot take the square root of a larger number that can be multiplied by another to give 242 then we say that 121 is the largest perfect square factor
  • Introduction to Surds (examples, solutions, videos, worksheets, games . . .
    In mathematics, a surd is an irrational number that is expressed as a root (like a square root, cube root, etc ) of a rational number, where the root cannot be simplified to a whole number or a rational fraction





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