biology
noun
bi·ol·o·gy
bī-ˈä-lə-jē 
1
: a branch of knowledge that deals with living organisms and vital processes
advances in the field of biology
a biology textbook
2
a
: the plant and animal life of a region or environment
the biology of the rainforest
b
: the life processes especially of an organism or group
the biology of cancer cells
broadly
: ecology
Examples of biology in a Sentence
advances in the field of biology
the biology of the rain forest
the biology of tumor cells
Recent Examples on the Web
But still, space remains an unforgiving frontier — one that continues to push the limits of human biology with every mission.
—
Jake Parks, Discover Magazine, 1 Mar. 2025
This is the warning of an international team of researchers, including Shane DuBay, an assistant professor of biology at the University of Texas at Arlington.
—Dan Perry, Newsweek, 28 Feb. 2025
Neither one requires expensive gear—just a basic understanding of bass biology and a willingness to explore your local waters.
—Derek Horner, Outdoor Life, 27 Feb. 2025
Rights & Permissions Allison Parshall is an associate news editor at Scientific American who often covers biology, health, technology and physics.
—Allison Parshall, Scientific American, 25 Feb. 2025
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Cite this Entry
“Biology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/biology. Accessed 9 Mar. 2025.
Kids Definition
biology
noun
bi·ol·o·gy
bī-ˈäl-ə-jē
1
: a branch of knowledge that deals with living organisms and life processes
2
a
: the plant and animal life of a region or environment
b
: the life processes of an organism or group
Etymology
from German Biologie "biology," derived from Greek bi-, bio- "life" and -logia "study, science"
Medical Definition
biology
noun
bi·ol·o·gy
-jē
plural biologies
1
: a branch of science that deals with living organisms and vital processes
2
a
: the plant and animal life of a region or environment
b
: the laws and phenomena relating to an organism or group
3
: a treatise on biology
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