sai (sa?) n1. (Animals) a South American monkey2. (Animals) a bird found in tropical America3. (Arms & Armour (excluding Firearms)) a type of daggerCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014