1Zoology. Each of a series of axial elements in the primitive vertebrate fin (archipterygium) or forelimb.
2Embryology. A mesodermal segment or somite; a protovertebra.
3Embryology. A blastomere of medium size, produced by some forms of embryonic cleavage.
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From meso- + -mere.
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