mammalian
Americannoun
adjective
Other Word Forms
- mammality noun
- nonmammalian noun
- unmammalian adjective
Etymology
Origin of mammalian
Explanation
Use the adjective mammalian to describe warm-blooded vertebrates with hair, or anything related to them. Your sister might be fond of snakes and frogs, while you'd prefer a mammalian pet, like a dog or cat. You, your pet dog, a gorilla, and a skunk all have something very important in common: you can all be described as mammalian, since you are all in the scientific class known as Mammalia. Mammalian characteristics range from having three small bones in each ear, to not being born inside an egg (with the exception of the platypus and other monotremes), to being nursed by a mother as an infant.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The focus of the convention on mammalian species over others like fish and insects has previously been a criticism of the agreement.
From BBC • Mar. 24, 2026
Perceptive viewers may have noticed a mammalian bias in the original — there were no reptiles to be found in its near-perfect society.
From Los Angeles Times • Dec. 23, 2025
The new field data and imagery collected by Vejmělka provide crucial insight into this rarely seen species and shed new light on the extraordinary mammalian biodiversity of New Guinea's remote highlands.
From Science Daily • Oct. 23, 2025
Each human and mammalian infection gives the virus an opportunity to mutate and evolve better ways of transmitting from person to person — a key benchmark for what makes a pathogen a pandemic-level threat.
From Salon • Apr. 30, 2025
It creates a massive vapor lock, as it were, in mammalian fuel lines: The body is prevented from turning what it eats into a source of usable energy.
From "Into the Wild" by Jon Krakauer
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
