源泉

yuánquán
  1. fountainhead
  2. well-spring
  3. water source
  4. fig. origin

CEDICT

Entry Composition

1 源 yuán
  1. root
  2. source
  3. origin
2 泉 quán
  1. spring (small stream)
  2. mouth of a spring
  3. coin (archaic)