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trocheidoscope
trocheidoscope n. 
/troʊˈkaɪdəˌskoʊp/ a rotating disc with coloured sectors, for showing combinations of colours ( Encycl. Dict. 1888). [ < trocho- comb. form + -eidoscope (in kaleidoscope n.).]
Brit. /trə(ʊ)ˈkʌɪdəskəʊp/
, /trə(ʊ)ˈkʌɪdəskəʊp/U.S. /trəˈkaɪdəˌskoʊp/
, /trəˈkaɪdəˌskoʊp//troʊˈkaɪdəˌskoʊp/<
as lemmas