Zond (z?nd) n (Astronautics) any of a series of unmanned Soviet spacecraft, first launched in 1964 as interplanetary space probes, the most successful of which, Zond 3, sent back photographs of the hidden side of the moon in 1965Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014