| NOUN | animal | chorionic villus | one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta |
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| Meaning | One of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta. | |
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| Part of | chorion | The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) |
| Broader | villus | A minute hairlike projection / projection on mucous membrane |
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