Megacosm Definition
    noun
  
 (obsolete) A macrocosm.
Wiktionary 
Other Word Forms of Megacosm
Noun
Singular:
 megacosmPlural:
 megacosmsOrigin of Megacosm
-  From French mégacosme, ultimately from Ancient Greek μεγα- (mega-) + κόσμος (kosmos). From Wiktionary 
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