Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Measurement of geologic time, as through isotopic radioactive decay.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology the
science of themeasurement of theage ofrocks etc. based on theradioactive decay of naturally occurringisotopes
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
geo- + chrono- + -metry
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