infrared

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
  2. noun electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
  3. adjective having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end

Etymology

From infra- + red\

Synonyms

infrared frequency

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