metamer

noun
meta·mer | \ˈmet-ə-ˌmər \

Medical Definition of metamer 

1 : a chemical compound that is metameric with one or more others

2 : either of two colors of different spectral composition that appear identical to the eye of a single observer under some lighting conditions but different under others or that under constant lighting conditions appear identical to some observers and different to others

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not any or not one

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