Kalkars Ordbog. Ordbog til det ældre danske sprog. Otto Kalkar's "Dictionary of older Danish" – or just "Kalkar's Dictionary" is a dictionary of the early stages of the Danish language, covering the period 1300-1700. It was first published in four volumes 1881-1907 with a supplementary volume in 1918. It was retrodigitized in 2017. The main information types of a full entry are: Headword (with variants) Part of speech Danish definitions or usage descriptions Quotations with sources Many entries hold only a small subset of this information. Minimal entries (especially from the supplementary volume), e.g. entries just listing a reference or an extra evidence are left out in the ELEXIS upload. The printed dictionary has a nested structure where derivations and compounds are listed under a main headword. In the digital version, main lemmas and sub-lemmas are all marked up as headwords at the same level.