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nova

noun [C]
 
 
/ˈnəʊ.və/ US  /ˈnoʊ-/ (plural novae) specialized

Definition

a type of star that shines much more brightly for a few months as a result of a nuclear explosionStars and constellations
(Definition of nova noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of nova