Growth or orientation of a sessile organism, especially a plant, toward or away from the light of the sun.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "heliotropism" in a sentence
"Besides the algae in their skin, they had altered hormone levels with predispositions toward heliotropism and nudity, plus numerous other "improvements.""
"His very geographical situation was sufficient to turn the mind towards him, but the particular reason for that heliotropism on the part of his feminine neighbors was that he was an easy man for a woman to ask."
"Since plants possess no nerves, this identity of animal with plant heliotropism can offer but one inference -- these heliotropic effects must depend upon conditions which are common to both animals and plants."