Architectionary.com
   A searchable architecture and construction related dictionary. All entries can be freely edited by the public.
   http://www.architectionary.com

Architectural Terms
   An illustrated glossary by Alice Cotton.
   http://www.artemisillustration.com/assets/text/Ornamental%20%20Terms_Glossary.htm

Art and Architecture
   Single-page glossary of art and architectural terms, from Your Way to Florence.
   http://www.arca.net/tourism/glossary.htm

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.
   http://www.getty.edu/research/conducting_research/vocabularies/aat/

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.
   http://ah.bfn.org/a/DCTNRY/vocab.html

California Missions Studies Terms
   Illustrated glossary of terms relating to California missions and other Hispanic sites by Sasha Honig.
   http://www.ca-missions.org/illusgl.html

Castle Glossary
   A full glossary from Castles of Britain.
   http://www.castles-of-britain.com/castle38.htm

Gardens Guide
   Glossary of terms used by garden historians and landscape architects, with links to examples in eTexts.
   http://www.gardenvisit.com/glossary/glossary.htm

Glossary of Medieval Art and Architecture
   An illustrated and cross-referenced dictionary of mainly architectural terms from Jane Vadnal of the University of Pittsburgh.
   http://www.pitt.edu/~medart/menuglossary/

Landscape Gardening and Architecture
   A brief cross-referenced glossary of gardening and landscape-architecture terms by John D. Tatter, Birmingham-Southern College.
   http://panther.bsc.edu/~jtatter/glossary.html

Looking at Buildings: Glossary
   An illustrated dictionary of architectural terms from the Pevsner Architectural Guides to the buildings of England, Ireland, Scotland and Wales.
   http://www.lookingatbuildings.org.uk/default.asp?document=2.30

Probert Encyclopaedia: Architecture
   An illustrated a-z of architectural styles and terminology.
   http://www.probertencyclopaedia.com/architecture.htm

The Conservation Glossary
   Architectural, building and conservation terms explained by Neil Grieve of The Centre for Conservation and Urban Studies, University of Dundee.
   http://www.trp.dundee.ac.uk/research/glossary/glossary.html