placentoid
Placentoid is a term used in biology and paleontology to describe organisms that possess a placenta or placenta-like structure. The word combines Latin placenta, meaning “flat cake” or “placenta,” with the suffix -oid, meaning “resembling.” In common usage, placentoid can refer to placental mammals or to lineages characterized by placentation, but it is not a formal, current taxonomic group in modern classifications.
In mammals, the placenta is an organ that connects fetal tissues to maternal blood supplies, enabling nutrient
Historically, placentoid has appeared in scholarly writings to describe mammalian taxa with placental development or to
See also: Placentalia, placenta, placenta types, mammal, viviparity.