placentally
/pləˈsɛntəli/ /pləˈsɛnt(ə)li/Chiefly Physiology and Zoology
adverb
By means of a placenta; in, through, or from the placenta.
Origin
Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From placental + -ly.