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The study of the effects of light on living organisms and biological processes.

pho′to·bi′o·log′ic (-bī′ə-lŏj′ĭk), pho′to·bi′o·log′i·cal (-ĭ-kəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) the branch of biology concerned with the effect of light on living organisms
photobiological, photobiologic adj
ˌphotobiˈologist n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌfoʊ toʊ baɪˈɒl ə dʒi)

the study of the effects of light on biological systems.
pho`to•bi`o•log′i•cal (-ˌbaɪ əˈlɒdʒ ɪ kəl) pho`to•bi`o•log′ic, adj.
pho`to•bi•ol′o•gist, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Polymorphous light eruption: A clinical, photobiologic and follow-up study of 110 patients.
This study demonstrated that the exposure of rats to UVA led to oxidative stress as reflected by increased MDA levels and reduced enzymic antioxidant levels, quercetin may be useful by reducing or preventing photobiologic damage.
A clinical photobiologic, histopathologic, and follow-up study of 16 patients.