Esaki diode (??s??k?) n (Electronics) another name for tunnel diode[named after L. Esaki (born 1925), its Japanese designer]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014