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- pronunciation:
- ar
ki
 n
- parts of speech:
- adjective, noun
| part of speech: |
adjective |
| definition: |
of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic.
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| part of speech: |
noun |
| definition: |
the Archean Period, or the rock formations that date from that time.
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