different between isomerism vs metamerism

English

From isomer +? -ism.

isomerism (countable and uncountable, plural isomerisms)

(chemistry) the phenomenon of the existence of isomers - the existence of different substances with the same molecular formulae
(chemistry) the interconversion of isomers
(nuclear physics) nuclear isomerism, the phenomenon of the existence of nuclear isomers

From ???? (metá, “among”) + ???????? (merismós, “rationing”) (< ????? (méros, “part”) + -????? (-ismós, “-ism”)).

metamerism (usually uncountable, plural metamerisms)

(biology) The segmentation of the body into similar discrete units.
(colorimetry) The matching of apparent color of objects with different spectral power distributions.
(chemistry) Structural isomerism.

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