1. (n.) A diseased condition of rye and other cereals, in which the grains become black, and often spur-shaped. It is caused by a parasitic fungus, Claviceps purpurea.

2. (n.) The mycelium or spawn of this fungus infecting grains of rye and wheat. It is a powerful remedial agent, and also a dangerous poison, and is used as a means of hastening childbirth, and to arrest bleeding.

3. (n.) A stub, like soft horn, about the size of a chestnut, situated behind and below the pastern joint.

4. (n.) See 2d Calcar, 3 (b).

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