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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.


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


(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.
References in periodicals archive ?
This is a rare malformation that has some similarities with retroperitoneal teratoma, but it is different from the latter by its fetiform aspect and the metameric segmentation of its spinal axis.2 However, not all reported cases of foetus-in-foetu have an identifiable spine.8-10