One of two or more substances related to each other by origin, structure, or function. [2]

1. Elements belonging to the same group on the periodic table. For example, sodium and potassium are congeners. 2. Compounds produced by identical synthesis reactions and procedures.

1730s, from French congénère (16c.), from Latin congener "of the same race or kind," from com- "together" (see com-) + gener-, stem of genus "kind" (see genus).

According to 40 CFR 766.3 [Title 40 Protection Of Environment Chapter I Environmental Protection Agency Subchapter R Toxic Substances Control Act Part 766 Dibenzo-Para-Dioxins/Dibenzofurans Subpart A [..]

(n) a minor chemical constituent that gives a wine or liquor its distinctive character(n) an animal or plant that bears a relationship to another (as related by common descent or by membership in the [..]

In strict usage, this term applies to the alcohols (other than ethanol}, aldehydes, and esters that are found in alcoholic beverages and contribute to the special aroma and taste of these drinks. However, "congener" is also used more loosely to mean any constituent of an alcoholic drink that imparts an aroma, taste, colour, or other chara [..]