piña (?pi?n?) n1. (Metallurgy) a cone-shaped piece of silver left after the mercury is extracted from an amalgam2. (Metallurgy) an amalgam of silver and mercuryCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014