  We present an interferometric measurement of the Sunyaev-Zel'dovich effect
(SZE) at 1 cm for the galaxy cluster Abell 2163. We combine this data point
with previous measurements at 1.1, 1.4, and 2.1 mm from the SuZIE experiment to
construct the most complete SZE spectrum to date. The intensity in four
wavelength bands is fit to determine the central Compton y-parameter (y_c) and
the peculiar velocity (v_p) for this cluster. Our results are
y_c=3.56(+0.41/-0.41)(+0.27/-0.19) x 10^-4 and v_p=410(+1030/-850)(+460/-440)
km/s where we list statistical and systematic uncertainties, respectively, at
68% confidence. These results include corrections for contamination by Galactic
dust emission. We find less contamination by dust emission than previously
reported. The dust emission is distributed over much larger angular scales than
the cluster signal and contributes little to the measured signal when the
details of the SZE observing strategy are taken into account.
