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The condition of having the body divided into metameres, apparent in certain animals only in the early embryonic stages of development.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Zoology) Also called: metameric segmentation or segmentation the division of an animal into similar segments (metameres). In many vertebrates it is confined to the embryonic nervous and muscular systems
2. (Chemistry) chem a type of isomerism in which molecular structures differ by the attachment of different groups to the same atom, as in CH3OC3H7 and C2H5OC2H5
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(məˈtæm əˌrɪz əm)

1. the body plan of animals in which the basic structure is a series of linear segments or somites.
2. isomerism resulting from the attachment of different groups to the same atom, as C2H5NHC2H5 and CH3NHC3H7.
[1840–50; (definition 1) metamere + -ism; (definition 2) meta- + (iso) merism]
met•a•mer•ic (ˌmɛt əˈmɛr ɪk) adj.
met`a•mer′i•cal•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
To assist with metamerism testing, the MM-2436e provides one-touch automatic light source sequencing.
How to define a "Honey Yellow" and what is the meaning of metamerism? Colour measurement of solid and metallic colours, flop index and sparkle evaluation is explained in a compact and easy to understand way.
Metamerism, morphogenesis, and the expression of carabelli and other dental traits in humans.
The big challenge is the substrate, which is highly porous for resins, as melamine must be impregnated into the surface, as well as controlling metamerism, or how the color looks in different lighting.
Manuck explained that when they first met, Turner was working to address the issue of "metamerism"--or how the same color can look very different depending on the substrate and on the light source involved.
In chapter 4, "Metamerism and Color Inconstancy," the perception of colors under different conditions is addressed.
There is also the issue of metamerism, seen when evaluating two different samples under different lights, revealing a difference in appearance under one light source that may not be evident under the other light.
Indices of metamerism were developed to quantify the amount of change a pair of matching colors would experience as the source was changed.
Vertebrae and intervertebral disc are one of the main manifestations of body segmentation or metamerism. The bodies of vertebrae, thus formed by metamerism can be fused partially or completely, such a fusion of vertebral bodies is called vertebralsynostosis or spinal fusion or block vertebra.
The weight of the chapter includes color stability, metamerism, apparent color, color constancy, colored light, colored light and vision, and color and meaning--all elements that would be especially valuable to the lighting designer.