| horse-leechery | The business of a farrier; especially, the art of curing the diseases of horses. Source: Websters Dictionary (01 Mar 1998) |
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| horse-radish | <botany> A plant of the genus Nasturtium (N. Armoracia), allied to scurvy grass, having a root of a pungent taste, much used, when grated, as a condiment and in medicine. Horse-radish tree. <botany> See Moringa. Source: Websters Dictionary (01 Mar 1998) |
| normal horse serum | The sterile and filtered serum of a healthy, unvaccinated horse. (05 Mar 2000) |