geophysics

noun

geo·​phys·​ics ˌjē-ə-ˈfi-ziks How to pronounce geophysics (audio)
plural in form but singular or plural in construction
: a branch of earth science dealing with the physical processes and phenomena occurring especially in the earth and in its vicinity
geophysical adjective
geophysically adverb
geophysicist noun

Did you know?

Geophysics applies the principles of physics to the study of the Earth. It deals with such things as the movement of the Earth's crust and the temperatures of its interior. Another subject is the behavior of the still-mysterious geomagnetic field. Some geophysicists seek out deposits of ores or petroleum; others specialize in earthquakes; still others study the water beneath the Earth's surface, where it collects and how it flows.

Word History

Etymology

International Scientific Vocabulary

First Known Use

circa 1889, in the meaning defined above

Time Traveler
The first known use of geophysics was circa 1889

Browse Nearby Words

Cite this Entry

“Geophysics.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/geophysics. Accessed 9 Sep. 2025.

Kids Definition

geophysics

noun
geo·​phys·​ics ˌjē-ə-ˈfiz-iks How to pronounce geophysics (audio)
: a science that deals with the physical processes occurring in or near the earth
geophysical adjective
geophysicist noun

More from Merriam-Webster on geophysics

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!