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Metamerism has several meanings in scientific terminolgy:


Metamerism (biology), in zoology and developmental biology, is the property of having repeated segments, for example in annelids.


Metamerism (color), in colorimetry, is a perceived matching of colors that, based on differences in spectral power distribution, do not actually match.


Diethyl ether and methyl propyl ether are examples for metamerism. Both have same molecular formula but different alkyl groups on the sides.

In chemistry, metamerism is the chemical property of having the different proportion of atomic components in different arrangements (obsolete, replaced with isomer). In organic chemistry, compounds having the same molecular formula but different number of carbon atoms (alkyl groups) on either side of functional group (e.g. −O−, −S−, −NH−, −C(=O)−, esters, amides, etc.) are called metamers, in a phenomenon called metamerism. For example, ether, with the molecular formula , can have two structures. This is a rare type of isomerism and is generally limited to molecules that contain a divalent atom (such as sulfur or oxygen) surrounded by alkyl groups.

Metamers are the compounds having same molecular formula but different position of atoms or groups on the either side of bridging functional groups.