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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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