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Webster 1913 Edition

Ultrared

Ulˊtra-red′

,

Adj.

[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

.

Definition 2025

ultrared

ultrared

English

Adjective

ultrared ‎(not comparable)

(dated) infrared

Noun

ultrared ‎(countable and uncountable, plural ultrareds)

(dated) infrared