adjective
Definition: Relating to or having a placenta, which is an organ that develops in the uterus during pregnancy to provide nutrients and oxygen to a developing baby.
Example: Humans are classified as placental mammals because they give birth to live young that are nourished before birth through a placenta.
noun
Definition: A type of mammal that gives birth to live young that have developed inside the mother's body, connected to her by a special organ called the placenta.
Example: Humans are classified as placental mammals because they give birth to fully developed babies.