A minor chemical constituent that gives a wine or liquor its distinctive character.
2.
An animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus). Synonyms:congenator, congeneric, relative.
3.
A whole (a thing or person) of the same kind or category as another. "The American shopkeeper differs from his European congener"
... fully described the leading types of the eggs of these Bulbuls under Molpastes haemorrhous. I shall therefore only here say that the eggs of this species in shape and colour exactly resemble those of its congener, but that as a body they are larger in size; every variety observable in the eggs of the one is, as far as I know, to be met with amongst those of the other. Taking only the eggs of typical birds from Lower Bengal and ... — The Nests and Eggs of Indian Birds, Volume 1 • Allan O. Hume