(a.) Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the red.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). ultrared. Retrieved September 22, 2026, from http://smartdefine.org/ultrared/definitions/2076087 |
| Chicago | Webster's. 2011. "ultrared" http://smartdefine.org/ultrared/definitions/2076087 (accessed September 22, 2026). |
| Harvard | Webster's 2011, ultrared, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/ultrared/definitions/2076087>. |
| MLA | Webster's. "ultrared" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/ultrared/definitions/2076087> |