noun, plural nebulae [neb-yuh-lee, -lahy], nebulas.
a. Also called diffuse nebula. a cloud of interstellar gas and dust.
Compare dark nebula, emission nebula, reflection nebula.
b. (formerly) any celestial object that appears nebulous, hazy, or fuzzy, and extended in a telescope view.
a. a faint opacity in the cornea.
b. cloudiness in the urine.
3. any liquid medication prepared for use as a spray.
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Origin: 1655-65; < Latin: a mist, vapor, cloud; akin to Greek nephélē cloud, German Nebel fog, haze
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