a. [ Pref. ultra- + red. ] (Physics) Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red. [ 1913 Webster ]
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
a. [ Pref. ultra- + red. ] (Physics) Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red. [ 1913 Webster ]