Nonluminescent

Part of speech: adjective

Definitions

1. Describing an object or substance that does not emit visible light naturally or when exposed to certain stimuli
2. Pertaining to materials or entities lacking the ability to produce or radiate light through chemical or physical processes
3. Characterizing things that remain dark and do not glow or shine in conditions where luminescence might otherwise occur

Etymology: "Nonluminescent" is a plain formation: the prefix "non-", meaning "not", attached to "luminescent," which describes a substance that gives off light without being hot enough to glow. Put together, the word names the absence of that quality, and it is used mainly in chemistry, physics, and mineralogy, where scientists need to distinguish materials that emit light from those that do not. The base word itself is the more interesting part. "Luminescent" is built from Latin "lumen," meaning "light," with the suffix "-escent," which signals the beginning or ongoing process of a state, as in "effervescent" or "iridescent." So the chain of meaning runs from a plain Latin noun for light, through a suffix that marks a process, to a modern scientific term, and "non-" simply reverses it.

Synonyms: non-luminous, non-glowing, non-radiant, dark, unilluminated

Antonyms: luminescent, glowing, radiant, illuminated, phosphorescent