Abstract
We report what we believe is the first experimental measurement of biaxiality in a cholesteric phase. This observation is made in a selectively deuterated nematic that was twisted by the addition of a chiral compound. A theoretically predicted biaxial order parameter (measured in terms of an asymmetry in the time-averaged deuterium quadrupole interaction) was found to be \ensuremath{\sim}${10}^{\ensuremath{-}3}$ for a pitch \ensuremath{\sim}3 \ensuremath{\mu}m and to increase both with decreasing pitch and as the isotropic phase is approached.
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