Etymology
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paperback (n.)

"book with a paper cover," 1899, from paper (n.) + back (n.).

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Definitions of paperback
1
paperback (n.)
a book with paper covers;
Synonyms: paperback book / paper-back book / softback book / softback / soft-cover book / soft-cover
2
paperback (adj.)
(of books) having a flexible binding;
Synonyms: paperbacked
From wordnet.princeton.edu