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chro·mo | \ ˈkrō-(ˌ)mō 
\
\ plural chromos
Definition of chromo
(Entry 1 of 2)
chromo-
combining formvariants:
or before vowels chrom-
Definition of chromo- (Entry 2 of 2)
1a : color : colored
chromolithograph
b : pigment
chromogen
2 : chromium
chromaffin
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Time Traveler for chromo
The first known use of chromo was in 1868
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