n. The antler of a hart, once used as a source of ammonia.
n. An aqueous solution of ammonia; smelling salts.
v. To revive with hartshorn smelling salts.
the GNU version of the Collaborative International Dictionary of English
n. The horn or antler of the hart, or male red deer.
n. Spirits of hartshorn (see below); volatile salts.
The Century Dictionary and Cyclopedia
n. The antler of the hart or stag, Cervus elaphus.
n. Spirit of hartshorn; ammonia.
n. In botany See hartshorn-plantain.
Word Usage
"For leavening, purists prefer a pinch of hartshorn aka baker's ammonia, which is traditional in Scandinavian baking and thought to produce a tender, fluffier crumb—but conventional baking powder more than suffices."