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tumbling-star
tumbling-star n. 
/ˈtʌmbl̩ɪŋstɑː/,
Brit. /ˈtʌmblɪŋstɑː/
, /ˈtʌmblɪŋstɑː//ˈtʌmbl̩ɪŋstɑː/U.S. /ˈtəmb(ə)lɪŋˌstɑr/
an iron ball with projecting spikes which is put into the tumbling-box to stir up the polishing or abrading medium ( Cent. Dict. Suppl. 1909)./ˈtəmb(ə)lɪŋˌstɑr/<
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