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It is shown that a sufficiently strong four-spin interaction in the spin-1/2spin ladder can cause dimerization. Such interaction can be generated either byphonons or (in the doped state) by the conventional Coulomb repulsion betweenthe holes. The dimerized phases are thermodynamically undistinguishable fromthe Haldane phase, but have dramatically different correlation functions: thedynamical magnetic susceptibility, instead of displaying a sharp single magnonpeak near $q = \pi$, shows only a two-particle threshold separated from theground state by a gap.Comment: 9 pages, LaTex, to be published in Phys. Rev. Lett., vol. 78, May  199

One-Dimensional Spin-Liquid without Magnon Excitations