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al·lan·to·cho·ri·on ə-.lan-(.)tō-'kōr-ē-.än, -'kȯr- n an embryonic membrane consisting of a fused allantois and chorion
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al·lan·to·cho·ri·on (ə-lan″to-korґe-on) a compound membrane formed by fusion of the allantois and chorion.Medical dictionary. 2011.