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The movement of an organism or a cell toward or away from a source of light.
pho′to·tac′tic (-tăk′tĭk) 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 movement of an entire organism in response to light
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
pho•to•tax•is(ˌfoʊ təˈtæk sɪs)
movement of an organism toward or away from a source of light.
pho`to•tac′tic (-ˈtæk tɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
the movement of an organism away from or toward a source of light. — phototactic, adj.See also: Light
the movement of an organism away from or toward a source of light. — phototactic, adj.See also: Motion
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.