designating or of the geologic eon usually subdivided into the Paleozoic, Mesozoic, and Cenozoic eras
Origin of Phanerozoic; from Classical Greek phaneros (see phanerogam) + -zoic
the Phanerozoic Eon or its rocks
Of, relating to, or being the geologic time period from approximately 542 million years ago to the present, comprising the Paleozoic, Mesozoic, and Cenozoic Eras, and marked by an abundance of fossil evidence of life, especially higher forms, in the corresponding rocks. See Table at geologic time.
The Phanerozoic Eon.
Origin of PhanerozoicGreek phaneros, visible (from phainein, to cause to appear; see bha-1 in Indo-European roots) + –zoic.