The Icelandic-Danish dictionary by Sigfús Blöndal was published in the years 1920−1924 and is now commemorated with an exhibition in the National Library a century after its first publication. The dictionary is a key work in the history of Icelandic dictionaries and is one of the largest Icelandic dictionaries that has been produced to date. Sigfús worked on the dictionary for many years together with his wife, Björga Þorláksdóttir Blöndal. They lived in Copenhagen during the work. A number of collaborators were involved in the creation of the dictionary. Grants for the work and publication came from Danish funds, as well as the Danish and Icelandic governments.
In 2016, a decision was made to make the Icelandic-Danish dictionary available online. The dictionary has over a thousand pages, all of which have been scanned, reviewed and the text made searchable. The publisher of the electronic version is the Árni Magnússon Institute for Icelandic Studies. The project is funded by the Icelandic-Danish Dictionary Fund.