extragalactic nebula:- (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula'' is a former name for `galaxy''" (Arabic WordNet)
extragalactic nebula:- (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust (Princeton WordNet 3.1)
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