Mammalia

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Definition

Proper noun The class of warm-blooded vertebrates characterized by the presence of mammary glands in females, which are used to feed their young with milk. Members of this class also typically have hair or fur, a four-chambered heart, and a neocortex region in the brain.

Usage Examples
  • The class Mammalia includes diverse animals such as whales, bats, elephants, and humans.
  • All members of Mammalia are endothermic, meaning they generate their own body heat.
  • The defining characteristic of Mammalia is the production of milk by females.
Advanced Usage
  • In taxonomic classification, Mammalia is a class within the subphylum Vertebrata. It is further divided into subclasses like Prototheria (monotremes), Metatheria (marsupials), and Eutheria (placental mammals).
  • The term is used in formal, scientific contexts such as biology, zoology, and paleontology.
Variants and Related Words
  • Mammal (noun): A single animal belonging to the class Mammalia.
    • Example: The bat is the only mammal capable of true flight.
  • Mammalian (adjective): Of or relating to mammals.
    • Example: The fossil showed clear mammalian characteristics.
Synonyms
  • Mammals (when used as a plural common noun referring to the group)
  • Class Mammalia (full taxonomic designation)
Notes on Meaning
  • Mammalia refers exclusively to the entire scientific class as a singular, proper noun entity. It is not typically used in everyday conversation but is standard in academic and scientific writing.
  • The common word for an individual animal from this class is "mammal."
Noun
  1. warm-blooded vertebrates characterized by mammary glands in the female

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