Noun
A fourth part of the coin called an as. See 3d As, 2.
The fourth of a penny; a farthing. See Cur.
Source: Webster's dictionaryThe 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