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Data are presented on the dielectric relaxation in supercooled liquid glycerol. These data span over 14 decades in frequency from 10⁻⁴ Hz to 2×10¹⁰ Hz. It is found that the peak in the imaginary part of the dielectric susceptibility has a temperature dependence that can be fit with a Vogel-Fulcher form: v = v₀ exp[− A/(T − T₀)]. The shape of the response function in the high frequency tail cannot be fit with a stretched-exponential form. However the data can be scaled onto a single master curve which has previously been shown to fit a number of other glass-forming liquids.