the branch of biology dealing with the functions and activities of living organisms and their parts, including all physical and chemical processes.
the organic processes or functions in an organism or in any of its parts.

1555–65; < Latin physiologia < Greek physiología science of natural causes and phenomena. See physio-, -logy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
physiology (ˌfɪzɪˈɒlədʒɪ)
1.  the branch of science concerned with the functioning of organisms
2.  the processes and functions of all or part of an organism
[C16: from Latin physiologia, from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1560s, "study and description of natural objects," from L. physiologia "natural science, study of nature," from Gk. physiologia "natural science," from physio-, comb. form of physis "nature" (see physic) + logia "study." Meaning "science of the normal function of living things"
is attested from 1615.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

physiology phys·i·ol·o·gy (fĭz'ē-ŏl'ə-jē)
Abbr. phys.

  1. The biological study of the functions of living organisms and their parts.

  2. All the functions of a living organism or any of its parts.

phys'i·ol'o·gist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
physiology   (fĭz'ē-ŏl'ə-jē)  Pronunciation Key 
The scientific study of an organism's vital functions, including growth and development, the absorption and processing of nutrients, the synthesis and distribution of proteins and other organic molecules, and the functioning of different tissues, organs, and other anatomic structures. Physiology studies the normal mechanical, physical, and biochemical processes of animals and plants.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

physiology definition

The study of the function of living things, including processes such as nutrition, movement, and reproduction. (Compare anatomy and morphology.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
You should also learn something of the laws of physics and physiology involved.
The two-hour program provides an introduction to shark physiology and
Candidates with a background in comparative animal physiology and experience in
  neurobiology are preferred.
He not only loves to work out, but he loves to study the physiology of it.
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