What is the meaning of congener?

noun

• A minor chemical constituent that gives a wine or liquor its distinctive character.
• An animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus.
  • synonyms: relative, congenator, congeneric
• A whole (a thing or person) of the same kind or category as another.
  • usage: "lard was also used, though its congener, butter, was more frequently employed"; "the American shopkeeper differs from his European congener"