pa·per·back 
(pāpər-băk′)
(pāpər-băk′)n.
A book having a flexible paper binding.
paper·back′, paper·backed′ adj.
- quadriplegia
- quadriplegic
- quadrivalence
- quadrivalency
- quadrivalent
- quadrivium
- quadroon
- quadru-
- quadru-
- quadrumanal
- quadrumanous
- quadrumvirate
- quadruped
- quadruped
- quadrupedal
- quadrupedalism
- quadrupedally
- quadruple
- quadruplet
- quadruple witching hour
- quadruplicate
- quadruplicately
- quadruplication
- quadruply
- quaestor