Meaning

noun a medicinal liquid preparation intended for use in an atomizer

noun cloudiness of the urine

noun an immense cloud of gas (mainly hydrogen) and dust in interstellar space

originBorrowed from Latin nebula (“little cloud, mist”). Akin to Ancient Greek νεφέλη (nephélē, “cloud”), German Nebel (“mist, nebula”), Old Norse nifl, Polish niebo (“sky, heaven”), Russian не́бо (nébo, “sky”).

Etymology from Wiktionary, CC BY-SA 3.0