二重根

èrchónggēn
a double root of an equation

CEDICT

Entry Composition

1 二重 èrchóng
  1. double
  2. repeated twice
2 根 gēn
  1. root
  2. basis
  3. classifier for long slender objects, e.g. cigarettes, guitar strings
  4. radical (chemistry)

classifier: 條