surd
noun · adjectiveA1Định nghĩa theo từ loại
Danh từ
noun- 1.
(arithmetic) An irrational number, especially one expressed using the √ symbol.
- 2.
(linguistics) A voiceless consonant.
Tính từ
adjective- 1.
(obsolete)Lacking the sense of hearing; deaf.
…how all Words fall to the Ground, spent upon such a surd and Earless Generation of Men, stupid unto all Instruction…
- 2.
(obsolete)unheard
- 3.
(mathematics) Involving surds, or irrational numbers; not capable of being expressed in rational numbers.
a surd expression or quantity; a surd number
- 4.
(phonetics) unvoiced; voiceless
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Nguồn gốc từ
mid 16th century from Latin surdus (deaf, mute), used in mathematics for “irrational,” reflecting ἄλογος (irrational, speechless) as found in Euclid, apparently transmitted via Arabic جِذْر أَصَمّ (deaf root). The phonetic sense, “voiceless,” emerged in the 18th century. surdo.