- BLITON: The Brittonic Language in the Old North
- Bosworth-Toller Anglo-Saxon Dictionary
- Dictionary of the Scots Language – Dictionar o the Scots Leid
- Dwelly, Edward, The Illustrated Gaelic-English Dictionary, 1918 edition
- Dwelly-d, searchable online version of Dwelly’s dictionary
- eDIL – Irish Language Dictionary
- Geiriadur Prifysgol Cymru
- Icelandic-English Dictionary (Cleasby-Vigfússon)
- Medieval Latin Lexicon
- Oxford English Dictionary
- Scots Words and Place-names: Place-name Glossary
- Scottish Language Dictionaries
- Beauly, The Aird and Strathglass Place-Name Survey (North-East Inverness-shire)
- Berwickshire: The Berwickshire Place-Name Resource
- Borders: May Williamson, The Non-Celtic Place-Names of the Scottish Border Counties
- Cateran Trail Place-Name Booklets
- Fife Place-name Data
- Midlothian: Norman Dixon, The Place-Names of Midlothian
- Strathearn Environs and Royal Forteviot: Place-Names in SERF