thermoperiodism[thûrˌmō-pîrˈē-ə-dĭzˌəm] also ther·mo·pe·ri·o·dic·i·ty [-dĭsˈĭ-tē]
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The effect on an organism of the rhythmic fluctuation of temperature, including responses associated with thermal changes accompanying the alternation of day and night.