Distilled spirits. Ethyl alcohol, hydrated oxide of ethyl, spirits of wine, whisky, rum, brandy, gin, and other distilled spirits, including all dilutions and mixtures thereof, for nonindustrial use. The term distilled spirits shall not include mixtures containing wine, bottled at 48 degrees of proof or less, if the mixture contains more than 50 percent wine on a proof gallon basis. The term distilled spirits also does not include products containing less than 0.5 percent alcohol by volume.
27 CFR § 5.11
When used in this part and in forms prescribed under this part, where not otherwise distinctly expressed or manifestly incompatible with the intent thereof, terms shall have the meaning ascribed in this section. Any other term defined in the Federal Alcohol Administration Act and used in this part shall have the same meaning assigned to it by such Act.