Simple - definition: A herbal simple is a herbal remedy with one ingredient, a "singleton".
As in -
"A certain shepherd lad
Of small regard to see to, yet well skilled
In every virtuous plant, and healing herb,
He would beg me sing;
Which, when I did, he on the tender grass
Would sit, and hearken even to constancy;
And in requital ope his leathern scrip,
And show me Simples, of a thousand names,
Telling their strange, and vigorous faculties." -- JOHN MILTON
Herbal simples have been in use for thousands of years.
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