American Heritage® Dictionary of the English Language, Fourth Edition
- n. A prenatal test to detect birth defects that is performed at an early stage of pregnancy and involves retrieval and examination of tissue from the chorionic villi. Also called chorionic villus biopsy.
- n. medicine A form or prenatal diagnosis in which part of the placental tissue is tested for genetic abnormalities
- n. a prenatal test to detect birth defects at an early stage of pregnancy; tissue from the chorionic villi is assayed
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