Definition of Phanerozoic
: of, relating to, or being an eon of geologic history that comprises the Paleozoic, Mesozoic, and Cenozoic or the corresponding systems of rocks — see geologic time table
Origin and Etymology of phanerozoic
Greek phaneros + English 2-zoic
First Known Use: 1930See Words from the same year
Seen and Heard
What made you want to look up Phanerozoic? Please tell us where you read or heard it (including the quote, if possible).