Dictionary.net

Ash, the bark of the trunk or root of Fraxinus americana, white American ash, or F. excelsior, European ash; employed as a tonic and astringent and in the treatment of gout and rheumatism in dose of gr. 30 (2.0), or of 31 (4.0) of the N.F. vinum fraxini.

The ash; a genus of the Oleaceae.

The inner bark of Fraxinus excelsior, formerly used in malarial fevers.

n. A genus of arborescent plants of several species, including the common ash.