book token 
noun British
A voucher which can be exchanged for books costing up to a specified amount.Besides a book token, they get a badge and certificate....
- Went out for a walk this afternoon, to spend a book token I got for Christmas, mainly just to see if a bit of retail therapy might snap me out of this melancholy mood.
- In fact, he accepted a book token from her as the English prize.
- cryptophytic
- cryptopine
- cryptoporticus
- cryptorchid
- cryptorchidism
- cryptorchism
- cryptosporidial
- cryptosporidiosis
- cryptosporidium
- cryptostoma
- cryptosystem
- cryptous
- cryptovolcanic
- cryptoxanthin
- cryptozoa
- cryptozoic
- cryptozoological
- cryptozoologist
- cryptozoology
- cryptozoon
- cryptozoön
- cryptozygous
- cry someone/thing up (or down)
- crystal
- crystal axis