Pronunciation: (am"nē-ō-sen-tē'sis), [key]
—pl. -sesPronunciation: (-sēz). [key]
a surgical procedure for obtaining a sample of amniotic fluid from the amniotic sac in the uterus of a pregnant woman by inserting a hollow needle through the abdominal wall, used in diagnosing certain genetic defects or possible obstetric complications.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.