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
Sleep doctors say a little better understanding of the adolescent biology of bedtime can help your teen sleep more.
—
NPR, 2 Nov. 2025
For instance, Bella's first meeting with Edward in their biology class is supposed to be this unnerving moment, where Bella is disturbed by Edward's apparent repulsion toward her.
—Edward Segarra, USA Today, 31 Oct. 2025
What follows is an unraveling of memory, identity, and biology itself.
—Kenna Hughes-Castleberry, Space.com, 31 Oct. 2025
Mrigakshi Dixit Mrigakshi is a science journalist who enjoys writing about space exploration, biology, and technological innovations.
—Mrigakshi Dixit, Interesting Engineering, 30 Oct. 2025
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NPR, 2 Nov. 2025
For instance, Bella's first meeting with Edward in their biology class is supposed to be this unnerving moment, where Bella is disturbed by Edward's apparent repulsion toward her.
—Edward Segarra, USA Today, 31 Oct. 2025
What follows is an unraveling of memory, identity, and biology itself.
—Kenna Hughes-Castleberry, Space.com, 31 Oct. 2025
Mrigakshi Dixit Mrigakshi is a science journalist who enjoys writing about space exploration, biology, and technological innovations.
—Mrigakshi Dixit, Interesting Engineering, 30 Oct. 2025
See All Example Sentences for biology
Cite this Entry
“Biology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/biology. Accessed 4 Nov. 2025.
Copy CitationKids 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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