Wine.

Wine. (a) Still wine, including vermouth or other aperitif wine, artificial or imitation wines or compounds sold as still wines, champagne or sparkling wine, and artificially carbonated wine, and (b) flavored or sweetened fortified or unfortified wines, by whatever name sold or offered for sale, containing not over 24 percent alcohol by volume.
(68A Stat. 917, as amended (26 U.S.C. 7805); 49 Stat. 981, as amended (27 U.S.C. 205); 26 U.S.C. 7805 (68A Stat. 917, as amended), and in 27 U.S.C. 205 (49 Stat. 981, as amended))

Source

27 CFR § 27.11

Scoping language

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. Words in the plural form shall include the singular, and vice versa, and words importing the masculine gender shall include the feminine. The terms includes and including do not exclude things not enumerated which are in the same general class.