| 单词 | Proterozoic |
| 释义 | Proterozoic /prot'euhr euh zoh"ik, proh'teuhr-/, Geol. adj. 1. noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, characterized by the appearance of bacteria and marine algae; Algonkian. n. 2. the Proterozoic division of geologic time or the rock systems formed then; Algonkian. See table under geologic time. [1905-10; PROTERO- + ZO- + -IC] |
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