nebula
nebula Lexical Profile
nebula Game Scores & Validity
• noun
A vast, diffuse cloud of interstellar gas and dust in outer space, visible in the night sky either as a luminous patch of light or as a dark silhouette against brighter celestial matter, and often serving as a region where new stars are formed.
"The space telescope captured a breathtaking infrared image of newborn stars emerging from the dense pillars of the Eagle Nebula."
A faint, slightly cloudy opacity on the cornea of the eye, typically resulting from superficial scarring or past inflammation.
"During the routine ophthalmic examination, the optometrist noted a small corneal nebula that had remained from a childhood eye injury."
Word Nuance & Usage
Both the Latinate plural "nebulae" and the regularized English plural "nebulas" are standard, though "nebulae" is strongly preferred in scientific and astronomical contexts.
Word Origin & Etymology
Borrowed directly from Latin nebula, meaning "mist," "vapor," or "cloud." In the early 18th century, astronomers adopted the term to describe any diffuse astronomical object, including distant galaxies before their true nature was resolved.