three-quar·ter-bound
ˈthrē-ˈk(w)ȯ(r)-tər-ˌbau̇nd
of a book
: bound like a half-bound book but having the material on the spine extended to cover about one third of the boards
three-quarter binding
noun
: a book binding in which the material (as leather) of the backbone and the corners is different from that of the sides and the material of the backbone extends upon the boards for one third of their width compare full binding, half binding, quarter binding
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Merriam-Webster unabridged



