Member of the North Germanic group of the Indo-European language family, spoken in Denmark and Greenland and related to Icelandic, Faroese, Norwegian, and Swedish. As one of the languages of the Vikings, who invaded and settled in parts of Britain during the 9th to 11th centuries, Old Danish had a strong influence on English. They, their, and them, as well as such sk- words as sky, skill, skin, scrape, and scrub, are of Danish origin. Danish place-name endings include by (a farm or town), as in Derby, Grimsby, and Whitby.