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ge⋅ol⋅o⋅gy

  [jee-ol-uh-jee]
Use geology in a Sentence
–noun, plural -gies.
1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is undergoing.
2. the study of this science.
3. the geologic features and processes occurring in a given region on the earth or on a celestial body: the geology of Mars; the geology of eastern Kentucky.
Origin:
1680–90; geo- + -logy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ge·ol·o·gy   (jē-ŏl'ə-jē)   
n.   pl. ge·ol·o·gies
  1. The scientific study of the origin, history, and structure of the earth.
  2. The structure of a specific region of the earth's crust.
  3. A book on geology.
  4. The scientific study of the origin, history, and structure of the solid matter of a celestial body.

[Medieval Latin geōlogia, study of earthly things : Greek geō-, geo- + Greek -logiā, -logy.]
ge'o·log'ic (jē'ə-lŏj'ĭk), ge'o·log'i·cal adj., ge'o·log'i·cal·ly adv., ge·ol'o·gist n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Geology

Ge*ol"o*gy\, n.; pl. Geologies. [Gr. ge`a, gh^, the earth + -logy: cf. F. g['e]ologie.]

1. The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series.

2. A treatise on the science.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : geology
Spanish: geología,
German: die Geologie,
Japanese: 地質学
More Translations »

geology

The science devoted to the study of the Earth, particularly the solid Earth and the rocks that compose it.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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geology 
1735, Mod.L. geologia "the study of the earth," from ge "earth" + logia, from logos "speech, word, discourse." In M.L., geologia (14c.) meant "study of earthly things," i.e. law, as distinguished from arts and sciences, which concern the works of God.
Online Etymology Dictionary, © 2001 Douglas Harper
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geology   (jē-ŏl'ə-jē)  Pronunciation Key 
  1. The scientific study of the origin of the Earth along with its rocks, minerals, land forms, and life forms, and of the processes that have affected them over the course of the Earth's history.
  2. The structure of a specific region of the Earth, including its rocks, soils, mountains, fossils, and other features.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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