surd.
An irrational number, especially one expressed using the √ symbol.
Meaning & usage
An irrational number, especially one expressed using the √ symbol.
A voiceless consonant.
Where this word comes from
First attested in the mid 16th century from Latin surdus (“deaf, mute”), used in mathematics for “irrational,” reflecting ἄλογος (álogos, “irrational, speechless”) as found in Euclid, apparently transmitted via Arabic جِذْر أَصَمّ (jiḏr ʔaṣamm, “deaf root”). The phonetic sense, “voiceless,” emerged in the 18th century. Doublet of surdo.
Lacking the sense of hearing; deaf.
unheard
Involving surds, or irrational numbers; not capable of being expressed in rational numbers.
a surd expression or quantity; a surd number
unvoiced; voiceless
Where this word comes from
First attested in the mid 16th century from Latin surdus (“deaf, mute”), used in mathematics for “irrational,” reflecting ἄλογος (álogos, “irrational, speechless”) as found in Euclid, apparently transmitted via Arabic جِذْر أَصَمّ (jiḏr ʔaṣamm, “deaf root”). The phonetic sense, “voiceless,” emerged in the 18th century. Doublet of surdo.
Try it on your idea.
surd has 4 characters. Say it out loud, try it alongside a description of your project, and see whether its meaning fits what you want to create.
These are naming prompts. Meanings and pronunciation can vary; existing brand and domain uses have not been checked.
Explore the name generatorA word with a source.
Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.