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plural nebulae or nebulas or (obsolete) nebulæ
(astronomy) A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes). quotations examples
Approximately 5 billion years ago, our solar nebula was formed as gravitational forces pulled interstellar gas and dust into a swirling mass around out newly formed sun.
2012, Chinle Miller, In Mesozoic Lands: The Mesozoic Geology of Arches and Canyonlands National Parks, Kindle edition
(archaic, medicine) A white spot or slight opacity of the cornea.
(obsolete, medicine) A cloudy appearance in the urine.