Tarragon n. : A plant of the genus Artemisa (A. dracunculus), much used in France for flavoring vinegar.

Example:
What are the best uses for Tarragon?

Taxonomy
Tarragon, French tarragon, Artemisia dracunculus, Russian tarragon, unranked, free encyclopedia, seed, herbs and spices, Tarragon Theatre, vigorous plant, little dragon, aromatic, perennial herb, family Asteraceae, herb, stems, early spring, spice.

Defination from the web:
Tarragon or dragon's-wort (Artemisia dracunculus L.) is a perennial herb in the family Asteraceae related to wormwood. ... Tarragon is used to flavor a popular carbonated soft drink in the countries of Armenia, Georgia and, by extension, Russia and Ukraine. ...