pla ‧ cen ‧ ta /pləˈsentə/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: Latin ; Origin: 'flat cake' , from Greek , from plax 'flat surface' ]
an organ that forms inside a woman’s ↑ uterus to feed an unborn baby
—placental adjective [only before noun] :
placental blood