From perisseuō (to abound). That which is left over, the surplus, the abundance. Used of the twelve baskets of leftovers after feeding the five thousand.
After feeding five thousand, the disciples collected twelve baskets of leftovers (Mark 8:8). God's provision always exceeds the need. The surplus is not waste — it demonstrates that God gives more than enough. Jesus also taught that what comes out of the mouth flows from the overflow of the heart (Matthew 12:34).