Abrotonite is an archaic term for southernwood (Artemisia abrotanum), a species of Artemisia, a grouping of plants that also includes mugwort, wormwood, and sagebrush.
Southernwood was valued in antiquity for its medicinal and aromatic properties, and was used to flavor wines (according to Larousse). The term "Abrotonite" is often used in historical or botanical references to describe substances, remedies, or essences derived from this plant.