| 单词 | mesoderm | 
| 释义 | mes·o·derm    (mĕzə-dûrm′, mĕs-)n.  The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop. mes′o·dermal,  mes′o·dermic adj.  | 
	
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