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Definitions from the Web

Geologist

Noun

A geologist is a scientist who studies the solid Earth, its rocks, and the processes that shape it.

Sense 1:

Someone who investigates the composition, structure, and history of the Earth's crust.

Example sentence: The geologist analyzed the rock samples to determine their mineral content.

Sense 2:

A person who studies the Earth's history by examining fossil and sediment records.

Example sentence: The geologist found an ancient fossil that provided valuable insight into the Earth's past.