nova -
a star that ejects some of its material in the form of a cloud and become more luminous in the process
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= antonym
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Wiktionary
Substantiv
nova -
Smoked Nova Scotia salmon.
Wikipedia
A nova is a cataclysmic nuclear explosion caused by the accretion of hydrogen onto the surface of a white dwarf star, which ignites and starts nuclear fusion in a runaway manner. Novae are not to be confused with supernovae or luminous red novae.
