biology
Americannoun
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the science of life or living matter in all its forms and phenomena, especially with reference to origin, growth, reproduction, structure, and behavior.
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the living organisms of a region.
the biology of Pennsylvania.
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the biological phenomena characteristic of an organism or a group of organisms.
She is studying the biology of worms, especially in regard to their reproductive behavior.
noun
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the study of living organisms, including their structure, functioning, evolution, distribution, and interrelationships
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the structure, functioning, etc, of a particular organism or group of organisms
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the animal and plant life of a particular region
Other Word Forms
Derived Forms
Etymology
Origin of biology
From the German word Biologie, dating back to 1805–15. See bio-, -logy
Compare meaning
How does biology compare to similar and commonly confused words? Explore the most common comparisons:
Explanation
Biology is the study of life and living organisms, from one-celled creatures to the most complex living organism of all — the human being. Biology includes the study of genes and cells that give living things their special characteristics. You may know that the ology suffix means "the study of," and the addition of the Greek bios, meaning "life," gives us the meaning of biology. According to Nobel Laureate Walter Gilbert, "Biology will relate every human gene to the genes of other animals and bacteria, to this great chain of being." Sometimes science isn't as pretty as that sounds (as you know if you've cut open worms or frogs in biology class).
Vocabulary lists containing biology
Words to Live By: Bio
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Power Suffix: -ology
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bio
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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.
At 30C or above, those risks "were between 1.5 and 3.5 times higher compared to conditions around 25C", said Valentina Mella, lead author of the study published in Biology Letters.
From Barron's • May 26, 2026
"Previously, such chelae were known from only three insect groups. This fossil therefore represents the fourth known case of these structures evolving independently in insects," explains Privatdozent Carolin Haug, zoologist at LMU's Faculty of Biology.
From Science Daily • May 25, 2026
The findings were published May 19, 2026, in Biology of Sex Differences.
From Science Daily • May 20, 2026
In a peer-reviewed study published in the Journal of Vertebrate Paleontology, scientists from the University of Washington Department of Biology and the Burke Museum analyzed fossil remains and noticed unusual limb proportions.
From Science Daily • Apr. 23, 2026
The photo is a cameo of Martin and me sharing a microscope in AP Biology.
From "You Bring the Distant Near" by Mitali Perkins
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.
