adj, name ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Of a geologic era within the Proterozoic eon; comprises the Calymmian, Ectasian and Stennian periods from about 1600 to 900 million years ago, when the Rodinia supercontinent was formed. not-comparable

Proper Noun

1. 1
   The Mesoproterozoic era.

Etymology

From meso- + Proterozoic.