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tumbling-wheel
tumbling-wheel n. 
/ˈtʌmbl̩ɪŋwiːl/,
Brit. /ˈtʌmblɪŋwiːl/
, /ˈtʌmblɪŋwiːl//ˈtʌmbl̩ɪŋwiːl/U.S. /ˈtəmb(ə)lɪŋˌ(h)wil/
a revolving chamber in which small wooden objects are smoothed by attrition; cf. tumbling-box n./ˈtəmb(ə)lɪŋˌ(h)wil/<
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