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Cataclysmic variable star

stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state

Pronunciation
/ˌkædəˈklɪzmɪk ˈvɛriəbəl stɑr/
/katəˈklɪzmɪk ˈvɛːrɪəbəl stɑː/