Zwicky (?tsv?k?) n (Biography) Fritz. 1898?1974, Swiss astronomer and physicist, working in the US from 1925; noted for his study of supernovaeCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014