redwardadj.adv.
/ˈrɛdwəd/, U.S. /ˈrɛdwərd/ Physics.
A. adj.
Situated towards the red end of the visible spectrum; occurring in the direction of the red end.
ΘΚΠ
the world > matter > colour > named colours > red or redness > [adjective] > towards red end of spectrum
redward1880
1880 Proc. Royal Soc. 31 36 The redward part of the band is the most persistent and is the last to disappear on dilution.
1889 N. Lockyer in Proc. Royal Soc. 1888–9 45 185 Some of the bright lines observed are described as being to the redward side of dark lines.
1927 Publ. Allegheny Observatory 6 136 The redward shifts of the solar lines.
1946 Nature 10 Aug. 205/2 The departure from the normal redward shift must be due to changes in the sun, and may readily be attributed to movements of the sodium vapour.
1995 Sci. Amer. Aug. 90/3 In the 1920s and 1930..Edwin P. Hubble and his associates discovered the redward shift of light from distant galaxies.
B. adv.
Towards the red end of the visible spectrum; in the direction of the red end.
ΘΚΠ
the world > matter > colour > named colours > red or redness > [adverb] > towards red end of spectrum
redwards1891
redward1903
1903 A. M. Clerke Probl. Astrophysics 224 All showed a much smaller displacement redward than the dark lines.
1928 Jrnl. Philos. 25 571 It is theoretically possible, whatever pair of hues be taken, always to find another violet-ward of one and red-ward of the other.
1973 Sci. Amer. May 118/1 A scarlet pigment, mercuric sulfide, is..a low-frequency reflector, reflecting about equally everything redward of a half-reflecting point in the orange.
2007 Icarus 186 577/1 When radiation acceleration imparts an anti-sunward velocity to the sodium atom, the solar spectrum seen by the atom will shift redward.
This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022).
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adj.adv.1880