Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


Any of the homologous segments that compose the bodies of certain animals; a somite.

met′a·mer′ic (-mĕr′ĭk, -mîr′-) adj.
met′a·mer′i·cal·ly adv.


(Zoology) one of the similar body segments into which earthworms, crayfish, and similar animals are divided longitudinally. Also called: somite
[C19: from meta- + -mere]
metameral adj


(ˈsoʊ maɪt)

1. any of the longitudinal series of segments or parts into which the body of certain animals is divided; a metamere.
2. one of the thickened segments of tissue that occur in pairs along the back of the vertebrate embryo.
[1865–70; < Greek sôm(a) body]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.metamere - one of a series of similar body segments into which some animals are divided longitudinallymetamere - one of a series of similar body segments into which some animals are divided longitudinally
segment - one of the parts into which something naturally divides; "a segment of an orange"
References in periodicals archive ?
The volume of local anesthetic administered in the initial bolus was calculated at around 0.5-1 ml per metamere to be covered in function of the stage of labor.
For example, as shown in Figure 2, Ubx-YFP is expressed in a series of repeat units, called metameres. The boundaries of the metamere do not coincide with the boundaries of the segmental neuromere and epidermis [17, 18], but they coincide with the parasegmental boundaries.
As mentioned, for some of our experiments, earthworms had their suprapharyngeal ganglia removed, which is accomplished by using a razor blade to cut a single midline incision into the dorsal surface from the earthworm's first metamere to its fourth metamere.