One of the mysteries of the English language finally explained.
Physics and Astronomy. Situated towards the blue end of the visible spectrum; occurring in the direction of the blue end.
Towards the blue; (Physics and Astronomy) towards the blue end of the visible spectrum; in the direction of the blue end.
Late 19th century; earliest use found in Michael Foster (1836–1907), physiologist and politician. From blue + -ward.
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