the GNU version of the Collaborative International Dictionary of English
adj. Situated beyond or below the red rays.
The Century Dictionary and Cyclopedia
Beyond the red: used of the invisible heat-rays, less refrangible than those forming the lower or red part of the spectrum, more commonly called the infra-red rays. See spectrum.
Word Usage
"Its main console was installed in a specially designed executive office, mounted on an enormous executive desk of finest ultramahagony topped with rich ultrared leather."