垫子

墊子
diànzi
cushion; mat; pad

CEDICT

Entry Composition

1 垫 diàn
  1. pad
  2. cushion
  3. mat
  4. to pad out
  5. to fill a gap
  6. to pay for sb
  7. to advance (money)
2 子 zi noun suffix, as in 椅子 yǐzi "chair"