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chromatography (n.)

"a treatise on colors," 1731, from chromato-, Latinized combining form of Greek khrōma (genitive khrōmatos) "color" (see chroma), denoting "color" or "chromatin" + -graphy. Related: Chromatograph.

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Definitions of chromatography from WordNet

chromatography (n.)
a process used for separating mixtures by virtue of differences in absorbency;
From wordnet.princeton.edu