a stag, or male deer, in the sixth year. See Cervus.

Hart's horns, in pharmacy, the whole horns of the common male deer, as separated from the head, without farther preparation.

The chemical analysis of hart's-horn is sufficiently known: it yields a water highly impregnated with a volatile salt, which is called spirit of hart's horn, with a fetid oil, and a volatile salt by the common distillation in a retort.

The salt of hart's horn is a great sudorific, and is given in fevers of many kinds with great success; the spirit has the same, and all the other virtues of volatile alkalis, and is used to bring people out of faintings by its pungency, on holding it under their nose, and at the same time pouring some drops of it in water down the person's throat.

Hart-wort, in botany. See Tordylium.