photo dynamical


noun (used with a singular verb)
the science dealing with light and its effects on living organisms.

1885–90; photo- + dynamics

photodynamic, photodynamical, adjective
photodynamically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photodynamics (ˌfəʊtəʊdaɪˈnæmɪks)
(functioning as singular) the branch of biology concerned with the effects of light on the actions of plants and animals

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

photodynamics pho·to·dy·nam·ics (fō'tō-dī-nām'ĭks)
The science that deals with the activating effects of light on living organisms.

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
photodynamics   (fō'tō-dī-nām'ĭks)  Pronunciation Key 
The scientific study of the effects of light on organic compounds and on the metabolisms of living things.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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