metamerism
Americannoun
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Zoology.
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division into metameres, the developmental process of somite formation.
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existence in a metameric state.
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Chemistry. isomerism resulting from the attachment of different groups to the same atom, as C 2 H 5 NHC 2 H 5 and CH 3 NHC 3 H 7 .
noun
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Also called: metameric segmentation, segmentation. the division of an animal into similar segments (metameres). In many vertebrates it is confined to the embryonic nervous and muscular systems
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chem a type of isomerism in which molecular structures differ by the attachment of different groups to the same atom, as in CH 3 OC 3 H 7 and C 2 H 5 OC 2 H 5
Etymology
Origin of metamerism
1840–50; metamerism ( in def. 1 ) metamere + -ism; metamerism ( in def. 2 ) meta- + (iso)merism
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Segmentation is seen in internal anatomy as well, which is called metamerism.
From Textbooks ● Jan. 1, 2015
This metamerism is thought to arise from identical teloblast cells in the embryonic stage, which give rise to identical mesodermal structures.
From Textbooks ● Jan. 1, 2015
Segmentation is both external and internal, which is called metamerism.
From Textbooks ● Apr. 25, 2013
This type of body plan is called metamerism.
From Textbooks ● Apr. 25, 2013
A satisfactory consideration of the structure of the Arthropods demands a knowledge of what may be called the laws of metamerism, and reference should be made to the article under that head.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" by Various
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
