amniocentesis: (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities
centesis: (surgery) the act of puncturing a body cavity or organ with a hollow needle in order to draw out fluid
permanent tooth: any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age