A Dictionary of Military Architecture: A dictionary of military architecture, fortification and fieldworks from the Iron Age to the eighteenth century by Stephen Francis Wyley.
Architectionary.com: A searchable architecture and construction related dictionary. All entries can be freely edited by the public.
Architectural Terms: An illustrated glossary by Alice Cotton.
Art and Architecture: Single-page glossary of art and architectural terms, from Your Way to Florence.
Art and Architecture Thesaurus: A structured vocabulary from the Getty Trust of more than 125,000 terms for describing fine art, architecture, decorative arts, archival materials, and material culture.
Buffalo Illustrated Architecture Dictionary: Indexed, cross-referenced and illustrated dictionary of architectural terms from Chuck LaChiusa. All examples are from buildings in Buffalo, New York.
California Missions Studies Terms: Illustrated glossary of terms relating to California missions and other Hispanic sites by Sasha Honig.
Castle Glossary: A full glossary from Castles of Britain.
Gardens Guide: Glossary of terms used by garden historians and landscape architects, with links to examples in eTexts.
Glossary of Medieval Art and Architecture: An illustrated and cross-referenced dictionary of mainly architectural terms from Jane Vadnal of the University of Pittsburgh.
Landscape Gardening and Architecture: A brief cross-referenced glossary of gardening and landscape-architecture terms by John D. Tatter, Birmingham-Southern College.
Looking at Buildings: Glossary: An illustrated dictionary of architectural terms from the Pevsner Architectural Guides to the buildings of England, Ireland, Scotland and Wales.
The Conservation Glossary: Architectural, building and conservation terms explained by Neil Grieve of The Centre for Conservation and Urban Studies, University of Dundee.