adj. Having the sort of flexible binding characteristic of a paperback book.
the GNU version of the Collaborative International Dictionary of English
adj. same as paperback.
The Century Dictionary and Cyclopedia
Having the back made or as if made of paper; hence, weak; flimsy.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (of books) having a flexible binding
Word Usage
"Using a record-sized camera they take color shots of the material to be reproduced, etch the exposures so obtained on copper plates, and use the plates for printing by the gravure process on an extremely thin paperbacked film."