dial. form of HERB.
1845. S. Judd, Margaret, I. v. 27. Stultiloquent yarb-monger! he [the schoolmaster] broke out.
1847. Thoreau, Lett., in Atlantic Monthly (1892), June, 736. I hope he got yarhs enough to satisfy him.
1855. Kingsley, Westw. Ho!, iv. Some skill in yarbs, as she called her simples.