ULTRARED

Etymology

Adjective

ultrared (not comparable)

(dated) infrared

Noun

ultrared (countable and uncountable, plural ultrareds)

(dated) infrared

Source: Wiktionary

Ul`tra*red", a. Etym: [Pref. ultra- + red.] (Physics)

Definition: Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red.

Source: Webster’s Unabridged Dictionary 1913 Edition