n. A member of the last royal family of France, or of any of its branches.n. One who, as was said of the Bourbons, “forgets nothing and learns nothing”; hence, in United States politics, an extreme conservative; especially, one who is behind the time and is opposed to all progress: originally applied to certain members of the Democratic party.n. [lowercase] A kind of whisky made of wheat or Indian corn: originally limited to the corn-whisky made in Bourbon county, Kentucky.