(A title given to) any of various books, characteristically bound in blue, and typically containing reports, records, instructions, and the like…

any of various official (esp. governmental) documents bound in green; cf. blue book, n.

A book bound in covers of stiff paper or flexible card. in paperback: in an edition bound in stiff paper or flexible card. Cf. hardback, n. 2.

a stiff paper cover (or one of a pair) for a book; (also) a book with such a cover, a paperback.

A cheap novel with a yellow cover; (more generally) any cheaply issued or reprinted novel, typically having sensational subject matter. Cf. yellow…

(a) (see quot. 1888); (b) slang a bed bug (Farmer); (c) a book whose back is flat when the book is closed; (d) various other technical senses (see…

A book with a green cover. Cf. yellowback, n. 3.

Chiefly U.S. A book bound in paper covers; a paperback.

Originally U.S. A paperback book; = paperback, n. in softback: in a paperback edition. Cf. hardback, n. 2.

A book bound in stiff covers. Cf. hardcover, n. 2.

A book, etc., bound in a stiff cover; a hardback.

Chiefly in form pocket book. A small book, adapted so as to be conveniently carried in a person's pocket. In later use chiefly North American: a…

A paperback book. in softcover: in a paperback edition. Cf. softback, n. 2.

a type of paperback book that is of higher quality, larger in size, and more expensive than a mass-market edition.