Home › Words › F › flexibackflexibackflexiback means having a flexible binding, as opposed to hardcover.EtymologyFrom flexi- + back.adjHaving a flexible binding, as opposed to hardcover.e.g.“The Book Machines Co. Ltd. announce an attachment to their flexiback book binding machine for the preparatory operations in “unsewn” binding.” — 1950, Library Science Abstracts, page 31:nounA book of this kind.Definitions & examples from Wiktionary (CC BY-SA 3.0).