geologist

IPA/dʒiˈɒlədʒɪst/
KK[dʒiˈɑlədʒəst]IPA/dʒiˈɑːlədʒɪst/

geologist — noun

  • geologistsingular
  • geologistsplural

1. A scientist who examines the rocks, soil, and physical structures of the Earth i

1.nounB2
Definition

A scientist who examines the rocks, soil, and physical structures of the Earth in order to understand how the planet formed and continues to change.

Example

Aiko, a geologist from Sapporo, studies volcanic rocks near Mount Fuji for her research.

geologist + from [place] + examined [rock type]

A construction team hired a geologist to test whether the ground was safe for a bridge.

hired a geologist to test [ground condition]

Common collocations
  • field geologist
  • petroleum geologist
  • marine geologist
  • geologist by training
  • consulting geologist
Synonyms
  • earth scientist

    Broader term that also covers oceanographers and atmospheric scientists

Grammar Patterns

geologist + who-clause

Usage Note

Geologist is a countable noun. It refers specifically to a professional scientist — not to an amateur who collects rocks as a hobby. The noun form geology (uncountable) names the field of study.

Common Mistakes

My uncle is a geology.
My uncle is a geologist.
Geology is the subject or field of study; geologist is the person who studies it.
The geologist studied the rock's structure careful.
The geologist studied the rock's structure carefully.
The adverb form carefully is needed to modify the verb, not the adjective careful.

Word family

Synonym discussion

Sense: noun/1

Earth scientist is the broadest term, covering anyone who studies the planet's physical systems — including oceans and atmosphere. A geophysicist focuses on the Earth's physical properties such as magnetic fields and seismic waves, often using mathematical models. A petrologist is a specialised type of geologist who studies the origin, composition, and structure of rocks in detail. For example, a geophysicist might interpret earthquake data to map underground faults, while a petrologist analyses a thin slice of granite under a microscope to determine how it crystallised.

earth scientistgeophysicistpetrologist

Common collocations

Nouns

Phrases

  • work as a geologist
  • trained as a geologist
  • geologist by profession

Prepositions

Etymology

GreekFrenchEnglish

The word geologist was formed in the 1700s from two Greek roots: geo- meaning 'earth' and -logia meaning 'study of' or 'discourse'. It entered English through French géologiste, and early users described people who studied the Earth's rocks and minerals as a branch of natural history.