photopositivityn.
/ˌfəʊtəʊˌpɒsᵻˈtɪvᵻti/, U.S. /ˌfoʊdəˌpɑzəˈtɪvᵻdi/, /ˌfoʊdoʊˌpɑzəˈtɪvᵻdi/ Zoology.
Tendency to move towards light.
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the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > photoconduction > increase or decrease when illuminated
photonegativity1921
photopositivity1962
1962 Jrnl. Insect Physiol. 8 251 Photopositivity declines continuously within each instar, but shows an increase after each moult.
1979 Amer. Naturalist 114 890 The increased photopositivity of excited flies has been noted.
1991 Jrnl. Exper. Marine Biol. & Ecol. 149 224 This photopositivity was expressed by a rapid concentration of the animals in the most illuminated areas.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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