[mass noun](Astronomy)(in the big bang theory) the primordial matter of the universe, originally conceived as composed of neutrons at high temperature and density (天文)伊伦,原元素(大爆炸理论中提出的,存在于宇宙中的一种原初物质,据认为是由高温、高密度状态下的中子构成)
语源
1940s: from late Latin hylem (accusative) 'matter'