Bible Dictionaries
Infra-Red

Webster's Dictionary

(a.) Lying outside the visible spectrum at its red end; - said of rays less refrangible than the extreme red rays.

Bibliography Information
Webster, Noah. Entry for 'Infra-Red'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​i/infra-red.html. 1828.