In the title compound, C(39)H(26)O, the cyclo-penta-[a]acenaphthyl-ene skeleton displays the expected distortions, with formal sp(2) bond angles as high as C-C-C = 142.50 (10)°. The OH group forms inter-molecular hydrogen bonds via x-axis translation to the centroid (Cg) of the pendant phenyl ring of the biphenyl system, with H⋯Cg = 2.41 Å and O-H⋯Cg = 153°.