extragalactic nebula is a noun meaning "(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust". It carries one recorded sense.
(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'”
astronomy
Definitions, synonyms and semantic relations for extragalactic nebula come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.