From Longman Dictionary of Contemporary EnglishPalaeozoicPal‧ae‧o‧zo‧ic British English, Paleozoic American English /ˌpæliəˈzəʊɪk, ˌpeɪ- $ ˌpeɪliəˈzoʊ-/ adjective belonging or relating to the period of time in the Earth’s history, from about 570 million years ago to about 245 million years ago, when fish, insects, reptiles and some plants first started to exist → mesozoic
