[foh-toh-bahy-ot-ik, -bee-]
adjective Botany, Zoology.
living or thriving only in the presence of light.

photo- + biotic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

photobiotic pho·to·bi·ot·ic (fō'tō-bī-ŏt'ĭk)
Depending on light for life and growth.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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