
1) Color
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https://www.crosswordclues.com/clue/metamerism

Metamerism has at least three meanings: ...
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http://en.wikipedia.org/wiki/Metamerism
[biology] In biology, metamerism is a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. In animals, metameric segments are referred to as somites or metameres. In plants, they are referred to as metamers...
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http://en.wikipedia.org/wiki/Metamerism_(biology)
[color] In colorimetry, metamerism is the matching of apparent color of objects with different spectral power distributions. Colors that match this way are called metamers. A spectral power distribution describes the proportion of total light emitted, transmitted, or reflected by a color sample at every visible wavelength; it precisely defi...
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http://en.wikipedia.org/wiki/Metamerism_(color)

• (n.) The symmetry of a metameric structure; serial symmetry; the state of being made up of metameres. • (n.) The state or quality of being metameric; also, the relation or condition of metameric compounds.
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http://thinkexist.com/dictionary/meaning/metamerism/

(from the article `colour`) ...the other by a combination of red and yellow pigments, match precisely in daylight, in the light of a tungsten lamp one may appear more reddish ...
Found on
http://www.britannica.com/eb/a-z/m/78

An effect where a colour appears to be different in different lights. Metamerism is a fact of nature and paints are often mistakenly blamed when metamerism is really the cause. The reason is that different types of light render colour differently. For example, natural sunlight contains more blue light, whereas artificial lights contain more orange....
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http://www.encyclo.co.uk/local/20471

The tendency of colour to change with the light source in which it's viewed. For example, two reds may appear to match under fluorescent light, but clash badly in the light of the sun.
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http://www.encyclo.co.uk/local/20829

<biology> The condition of developing body segments (such as in earthworms). ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973

Division of the body along the anteroposterior axis into a serial succession of segments, each of which contains identical or similar representatives of all the organ systems of the body; primitively in arthropods, including, externally, a pair of appendages and, internally, a pair of nerve ganglia, a pair of nephridia, a pair of gonads, paired blood vessels and nerves, and a portion of the digestive and muscular systems....
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http://www.encyclo.co.uk/visitor-contributions.php
Me·tam'er·ism noun 1. (Biol.) The symmetry of a metameric structure; serial symmetry; the state of being made up of metameres.
2. (Chemistry) The state or quality of being metameric; also, the relation or condition of metameric compounds.
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http://www.encyclo.co.uk/webster/M/56

Type: Term Pronunciation: me-tam′ĕr-izm Definitions: 1. A type of anatomic structure exhibiting serially homologous metameres; in primitive forms, such as the annelids, the metameres are almost alike in structure; in vertebrates, specialization in the cephalic region masks the underlying metamerism, which is still clearly evident in seri...
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http://www.medilexicon.com/medicaldictionary.php?t=54622

In chemistry, metamerism is the character in certain compound bodies differing in chemical properties, of having the same chemical elements combined in the same proportion and with the same molecular weight; thus, aldehyde and oxide of ethylene have their elements in the same proportion and the same molecular weight, 44. Metameric bodies do not, ho...
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http://www.probertencyclopaedia.com/browse/GM.HTM

A phenomenon that occurs when two objects appear to match in color under one light source, but not under another light source.
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http://www.sensationalcolor.com/understanding-color/theory/color-term-gloss

metamerism A situation in which there are many parts joined together.
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http://www.wordinfo.info/words/index/info/view_unit/2763/4

The phenomenon whereby colors of specimens match when illuminated by light of one spectral composition despite differences in spectral reflectance of the specimens, and that consequently may not match in light of some other spectral composition.
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https://www.hunterlab.com/en/color-measurement-learning/glossary/

A phenomenon exhibited by a pair of colors which match under one or more sets of real or calculated conditions and not match when these conditions are changed.
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https://www.xrite.com/learning/other-resources/glossary
No exact match found.