Definition

1. Adjective:

   • Of or relating to or belonging to the subclass Eutheria: Describes anything pertaining to the major subclass of mammals characterized by giving birth to live young that have been nourished in the womb by a placenta.

2. Noun:

   • A mammal having a placenta; all mammals except monotremes and marsupials: Refers to any member of the large group of mammals, including humans, dogs, whales, and rodents, whose embryos develop inside the mother's uterus with the aid of a placenta.

Examples of Usage

• Adjective:

  • The evolutionary history of eutherian mammals is a key topic in biology.
  • This fossil exhibits distinct eutherian characteristics.

• Noun:

  • Humans are classified as eutherians.
  • Unlike marsupials, eutherians have a highly developed placenta.

Advanced Usage

• In scientific classification: The term is used taxonomically to distinguish placental mammals from other mammalian subclasses (Metatheria/marsupials and Prototheria/monotremes).
  • The study compared the brain development in eutherians and metatherians.

Variants and Related Words

• Eutheria (n): The scientific name for the subclass of placental mammals.
  • Eutheria is the largest subclass of mammals.

Synonyms

• Placental mammal (n): The most common synonym for the noun form.
• Placental (adj/n): Often used interchangeably with "eutherian" in biological contexts.

Related Phrases

• Eutherian mammal: A common compound term used to specify the noun form clearly.
  • The whale is a eutherian mammal.

Adjective

1. of or relating to or belonging to the subclass Eutheria
   • eutherian mammals

Noun

1. mammals having a placenta; all mammals except monotremes and marsupials