The Collaborative International Dictionary
Hartshorn \Harts"horn`\ (-h[^o]rn`), n.
The horn or antler of the hart, or male red deer.
-
Spirits of hartshorn (see below); volatile salts.
Hartshorn plantain (Bot.), an annual species of plantain ( Plantago Coronopus); -- called also buck's-horn.
--Booth.Hartshorn shavings, originally taken from the horns of harts, are now obtained chiefly by planing down the bones of calves. They afford a kind of jelly.
--Hebert.Salt of hartshorn (Chem.), an impure solid carbonate of ammonia, obtained by the destructive distillation of hartshorn, or any kind of bone; volatile salts.
--Brande & C.Spirits of hartshorn (Chem.), a solution of ammonia in water; -- so called because formerly obtained from hartshorn shavings by destructive distillation. Similar ammoniacal solutions from other sources have received the same name.
Wiktionary
n. 1 (taxlink Plantago coronopus species noshow=1), a plant with leaf branched somewhat like the horn of a buck. 2 The plant (taxlink Lobelia coronopifolia species noshow=1).
Usage examples of "buck's-horn".
In the same belt was stuck one of those long, broad, sharp-pointed, and two-edged knives, with a buck's-horn handle, which were fabricated in the neighbourhood, and bore even at this early period the name of a Sheffield whittle.
And for moss, you are to note, that there be divers kinds of it, which I could name to you, but I will only tell you that that which is likest a buck's-horn is the best, except it be soft white moss, which grows on some heaths, and is hard to be found.