placental

Thân thiện

A placental mammal, like a dog, gives birth to live young.

Definition

1. Adjective:

   • Relating to, possessing, or facilitated by a placenta: Describes something connected to the specialized organ that develops in pregnant mammals to nourish the fetus.

2. Noun:

   • A mammal that possesses a placenta during gestation: A member of the infraclass Placentalia, characterized by giving birth to relatively developed live young after a long gestation period supported by a placenta.

Examples of Usage

• Adjective:

  • The doctor explained the placental connection between mother and fetus.
  • Whales exhibit a highly efficient placental structure.

• Noun:

  • Humans, dogs, and elephants are all placentals.
  • The evolution of placentals allowed for more complex fetal development.

Advanced Usage

• In scientific classification: Used to denote the major group Eutheria, often called placental mammals.
  • The fossil record provides clues about early placentals.

Variants and Related Words

• Placenta (n): The specific organ for fetal nourishment and waste removal.
  • The placenta is expelled after birth.
• Placentation (n): The formation or arrangement of the placenta.
• Aplacental (adj): Lacking a placenta.

Synonyms

• Eutherian (adj/n): A direct scientific synonym for placental mammals.
• Uterogestation (n): A term describing gestation within the uterus with a placental connection (related concept).

Related Phrases and Terms

• Placental barrier: The selective membrane in the placenta that regulates exchange between maternal and fetal blood.
• Placental abruption: A serious medical condition where the placenta detaches from the uterus wall prematurely.

Học thuật

Adjective

1. pertaining to or having or occurring by means of a placenta
   • all mammals except monotremes and marsupials are placental mammals

Noun

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

Từ đồng nghĩa

• placental mammal
• eutherian
• eutherian mammal