physiology

noun

phys·​i·​ol·​o·​gy ˌfi-zē-ˈä-lə-jē How to pronounce physiology (audio)
1
: a branch of biology that deals with the functions and activities of life or of living matter (such as organs, tissues, or cells) and of the physical and chemical phenomena involved compare anatomy
2
: the organic processes and phenomena of an organism or any of its parts or of a particular bodily process

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Physiology Has Latin Roots

The Latin root physio- generally means "physical", so human physiology deals with just about everything that keeps us alive and working, and other physiology specialties do the same for other animals and for plants. To do anything serious in the field of health, you've obviously got to know how the body's organs and cells function normally. Physiology used to be considered separately from anatomy, which focuses on the body's structures; however, it's now known that structure and function can't easily be separated in a scientific way, so "anatomy and physiology" are often spoken of in the same breath.

Examples of physiology in a Sentence

She took a course in anatomy and physiology. the physiology of diseased plants
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Guided by human physiology expert Christopher Minson, the researchers tracked a range of body signals – core temperature, blood pressure, heart rate, the heart's workload, and even the immune system’s activity. Pranjal Malewar, New Atlas, 5 July 2025 After a triumphant arm-wrestling moment against several male competitors at a party, Johnston dove into the physiology behind strength and found that women may actually be better suited to strength training in many ways. Popular Science Team, Popular Science, 18 June 2025 Unique physiology means everyone kicks differently from a biomechanical perspective, and thus players interact with different balls in unique ways. Liam Tharme, New York Times, 8 June 2025 The group said treating giraffes is especially difficult because they cannot be fully anesthetized due to their unique physiology. Lauren Liebhaber, Miami Herald, 3 June 2025 See All Example Sentences for physiology

Word History

Etymology

Latin physiologia natural science, from Greek, from physi- + -logia -logy

First Known Use

1615, in the meaning defined at sense 1

Time Traveler
The first known use of physiology was in 1615

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Cite this Entry

“Physiology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/physiology. Accessed 21 Jul. 2025.

Kids Definition

physiology

noun
phys·​i·​ol·​o·​gy ˌfiz-ē-ˈäl-ə-jē How to pronounce physiology (audio)
1
: a branch of biology dealing with the processes and activities by which life is carried on and which are special features of the functioning of living things, tissues, and cells
2
: the life processes and activities of a living thing or any of its parts or of a particular bodily process

Medical Definition

physiology

noun
phys·​i·​ol·​o·​gy ˌfiz-ē-ˈäl-ə-jē How to pronounce physiology (audio)
plural physiologies
1
: a branch of biology that deals with the functions and activities of life or of living matter (as organs, tissues, or cells) and of the physical and chemical phenomena involved compare anatomy sense 1, morphology sense 1
2
: the organic processes and phenomena of an organism or any of its parts or of a particular bodily process
the physiology of the thyroid gland
3
: a treatise on physiology

More from Merriam-Webster on physiology

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