Definition: The rhizome and roots of a number of species of Primula (family Primulaceae), primrose or cowslip; has been used as expectorant, diuretic, and anthelmintic. In some sensitive persons contact with the plant causes a rash.
[Mediev. L. primrose, fem. of L. primulus, first]
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Examples: glitazone, GI cocktail, etc.