redward
/ˈrɛdwəd/Physics
adjective
Situated towards the red end of the visible spectrum; occurring in the direction of the red end.
adverb
Towards the red end of the visible spectrum; in the direction of the red end.
Origin
Late 19th century; earliest use found in Proceedings of the Royal Society of London. From red + -ward. With use as adverb compare slightly earlier redwards.