Definition of quasar noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkweɪzɑː(r)//
; NAmE NAmE//ˈkweɪzɑːr//
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a large object like a star, that is far away and that shines very brightly and occasionally sends out strong radio signals compare pulsar Word Origin 1960s: contraction of quasi-stellar.
See the Oxford Advanced American Dictionary entry: quasar