Bible Dictionaries
Ultrared

Webster's Dictionary

(a.) Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red.

Bibliography Information
Webster, Noah. Entry for 'Ultrared'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/ultrared.html. 1828.