| burr | (noun) rough projection left on a workpiece after drilling or cutting | - |
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| (noun) rotary file for smoothing rough edges left on a workpiece | - |
| (noun) small bit used in dentistry or surgery | Synonyms: bur |
| (noun) seed vessel having hooks or prickles | Synonyms: bur |
| (verb) remove the burrs from | Synonyms: bur |
| churr | (verb) make a vibrant sound, as of some birds | Synonyms: whirr |
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| cockleburr | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cocklebur |
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| purr | (noun) a low vibrating sound typical of a contented cat | - |
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| (verb) indicate pleasure by purring; characteristic of cats | Synonyms: make vibrant sounds |
| (verb) make a soft swishing sound | Synonyms: birr, whir, whirr, whiz, whizz |