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tapetum
This term is a specialized anatomical descriptor used primarily in zoology and ophthalmology. It describes a biological mirror that allows animals to see more effectively in low-light environments, creating the characteristic "eye shine" seen when a flashlight hits a cat or deer's eyes.
In a technical context, it is often referred to as the tapetum lucidum. Because it is a specific anatomical structure, it is treated as a countable noun in scientific descriptions when comparing the layers across different species.
Meanings
A reflective layer of tissue located behind the retina in the eyes of many vertebrates, which reflects light back through the retina to increase the amount of light available to the photoreceptors, thereby enhancing night vision.
The cat's eyes glowed in the dark due to the reflective properties of the tapetum.