A combination of pulsed THz transmission and FTIR spectroscopy was employed to measure the normalized frequency dependent absorption coefficient of HCl in spherical, dipolar, and linear solvents (CCl4, CHCl3, and alkanes, respectively) in the 0−350 cm-1 portion of the far-infrared spectral region. The analysis applied to the measured spectra describes the interaction between the quantum mechanical rigid rotator motion of HCl and the solvent through explicit consideration of the anisotropic potential between HCl and the bath. Nominally, the theory requires two adjustable parameters to fit the solvated HCl absorbance spectra. However, a compilation of experimental results for HCl dissolved in various solvents of high symmetry reveals a quadratic dependence of one parameter, the mean square field of the bath, on solvent polarizability. It is shown that dipole−induced dipole (DID) interactions account for the observed quadratic form. This observation introduces a constraint that reduces the number of adjustable parameters so that unique values for the second fitting parameter, the exponential decay rate of the anisotropic potential time correlation function, may be extracted from the measured absorbance curves. The analysis of HCl−alkane solution spectra reveals a more subtle aspect of this dependence. Only a very weak polarizability dependence was found for solvents of large aspect ratio such as the alkanes. This difference indicates that the molecular polarizability density, not simply the molecular polarizability, dictates the strength of the solvent mean square field. Last, a simple scheme for classifying nonpolar solvents based on DID interactions between the solute and the bath is established.