- BLITON: The Brittonic Language in the Old North
- Bosworth-Toller Anglo-Saxon Dictionary
- Dictionaries of the Scots Language – Dictionars o the Scots Leid
- Dwelly, Edward, The Illustrated Gaelic-English Dictionary, 1918 edition
- eDIL – Irish Language Dictionary
- Geiriadur Prifysgol Cymru
- Icelandic-English Dictionary (Cleasby-Vigfússon)
- Logeion – Greek and Latin dictionaries combined, including the Dictionary of Medieval Latin from British Sources (2018).
- Medieval Latin Lexicon
- Middle English Dictionary
- Norwegian place-name lexicon
- ONP: Dictionary of Old Norse Prose
- Oxford English Dictionary
- Scots Words and Place-names: Place-name Glossary