photochemicaladj.
/ˌfəʊtə(ʊ)ˈkɛmᵻkl/, U.S. /ˌfoʊdəˈkɛmək(ə)l/ Of or relating to the chemical action of light (or similar radiation). Cf. photochemistry n.
ΘΚΠ
the world > matter > chemistry > chemistry as a science > branches of chemistry > [adjective]
mago-chemical1652
physico-chemical1664
chemico-medical1744
unorganic1775
pneumato-chemical1790
electrochemical1808
electrochemic1813
zymological1828
photochemical1858
thermochemical1871
physiochemical1881
stoicheiometrical1887
stereo-chemical1890
stoicheiometric1892
physical-chemical1896
zymotechnic1896
zymotechnical1900
photochemic1907
magnetochemical1911
immunochemical1912
radiochemical1915
topochemical1920
palaeochemical1926
cosmochemical1940
mechanochemical1943
radiation-chemical1946
sonochemical1948
stereological1963
bioinorganic1970
thermochemic-
the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > of chemical action of light
photochemical1858
1858 Philos. Trans. 1857 (Royal Soc.) 147 355 Certain conditions..must be fulfilled, if exact photo-chemical measurements with chlorine and hydrogen are required.
1859 Sat. Rev. 26 Feb. 242/1 The use of that bichromate of potassium to which we alluded before as the foundation of so many of these ingenious combinations of photochemical changes and mechanical inventions.
1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xii. 196 It is very likely that, at all events in the silent discharge, photochemical effects are present.
1957 G. E. Hutchinson Treat. Limnol. I. iv. 222 Mars may have lost more water than the earth by photochemical decomposition and by the subsequent escape of hydrogen.
1972 C. H. DePuy & O. L. Chapman Molecular Reactions & Photochem. iv. 63 Aromatic compounds undergo many photochemical transformations.
2000 S. Garfield Mauve 130 He mentioned artificial vanillin and violet and photochemical products.
Compounds
photochemical smog n. a condition of the atmosphere attributed to the action of sunlight on hydrocarbons and nitrogen in it, and characterized by the presence of aerosols and increased ozone and nitrogen oxides and by effects that include irritation of the eyes, damage to plants, and visibility reduced to a mile (1.6 km) or less.
ΘΚΠ
the world > physical sensation > cleanness and dirtiness > dirtiness > pollution or defilement > environmental pollution > [noun] > bad air > specific
smokiness1587
mephitism1801
smog1905
photochemical smog1957
vog1969
the world > the earth > weather and the atmosphere > weather > cloud > mist > [noun] > thick mist or fog > fog mixed with smoke > specific
photochemical smog1957
1957 Rep. Air Pollution Foundation (U.S.) No. 21. 1 It is now realized that Los Angeles' smog is primarily a reaction between organic matter and nitrogen oxides in the presence of sunlight. The need for irradiation to produce the reaction has led to the designation ‘photochemical’ smog.
1976 New Yorker 16 Feb. 74/2 Los Angeles is perhaps the best-known victim of the bus and the automobile; photochemical smog, the distinctive pollutant of these vehicles, made its first recorded appearance in Los Angeles in 1943.
1990 Green Mag. Apr. 79/2 (caption) Solvents..help create photochemical smog which harms lungs and plants.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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adj.1858