name of one of the 12 tribes of ancient Israel or its territory, named for its founder; literally "he who judges," related to Hebrew din "to judge." In the Old Testament, it occupied the northernmost part of Israel, hence its use proverbially for "utmost extremity," as in from Dan to Beersheba (the southernmost region), 1738. Related: Danite.
region at the southern extremity of South America, with -ia + Patagon, name given by Europeans to the Tehuelche people who inhabited the coasts of the region, sometimes said to mean literally "large-foot," from Spanish and Portuguese pata "paw, animal foot" (see patten) in reference to the people's llama-skin shoes. But elsewhere said to be from Patagon, name of a dog-headed monster in the prose romance "Amadís de Gaula" (1508) by Garci Ordóñez de Montalvo (which also might have yielded California). Related: Patagonian.
1550s in astronomy, in reference to a celestial circle, a line around the sky which, in any location, bounds the stars which are ever-visible from that latitude (in the Northern Hemisphere its center point is the celestial north pole); the concept goes back to the ancient Greeks, for whom this set of constellations included most prominently the two bears (arktoi), hence the name for the circle (see arctic). In Middle English it was the north cercle (late 14c.).
In geography, from 1620s as "the circle roughly 66 degrees 32 minutes north of the equator" (based on obliquity of the ecliptic of 23 degrees 28 minutes), marking the southern extremity of the polar day, when the sun at least theoretically passes the north point without setting on at least one summer day and does not rise on at least one winter one.