Dictionary of Petroleum and Oilfield Terminology
Glossary of terms. The list is searchable and also contains links to further information.
Earthquake Image Glossary
Heavily illustrated glossary of common terms in seismology.
Geological and Gem Terminology
Jillian Banfield's glossary of geological and gem-related vocabulary.
GeologyLink Glossary
Indexed glossary of geology terms.
Glacier Glossary
An A-to-Z glossary of glacier terms written by the professor and students of an NEIU glaciology class.
Glossary of Selected Geologic Terms
Glossary of selected geological terms from the University of Nebraska-Lincoln.
Illustrated Glossary of Geologic Terms
Based on the glossary in "Earth: An Introduction to Geologic Change", by S.Judson and S.M.Richardson. Includes related terms.
USGS Photo Glossary of Volcanic Terms
Illustrates and describes commonly used volcano-related terms.