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Definition of: mesenteron
(mes·en′tər·on) noun plural ·ter·a (-tər·ə) Biol.
1. The middle portion of the primitive intestinal cavity, lined with endoderm: distinguished from the buccal and anal parts, which are lined with ectoderm.
2. The midgut. [<MES- + ENTERON]
—mes·en′ter·on′ic (-tə·ron′ik) adjective
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