Proper noun
Quadrans Muralis
(astronomy, obsolete) A former constellation between Boötes and Draco, near the tail of Ursa Major.
The constellation was made obsolete in 1922 when the International Astronomical Union devised a new list of modern constellations - which did not include Quadrans Muralis - but the meteor shower still retains the name 'Quadrantids'. Source: Internet
The shower owes its name to the now-defunct constellation Quadrans Muralis. Source: Internet