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Definition of: mesoderm
(mes′ə·dûrm, mē′sə-) noun
1. Biol. The middle germ layer of the embryo, from which are developed the muscular, vascular, and osseous systems.
2. Bot. The middle layer of the wall of a moss and capsule.
—mes′o·der′mal, mes′o·der′mic adjective
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