† plaster clovern. (in form plaister claver) Obsolete common or ribbed melilot, Melilotus officinalis, formerly used as an ingredient in poultices.
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1597 J. GerardHerballii. cdlxxxviii. 1033 Of Melilot, or Plaister Clauer.
1896 New Sydenham Soc. Lexicon (at cited word)Plaister, Plaister claver, an old name for Meliotus officinalis, which was so-called from its use in plasters, some of which were in the Pharmacop. Lond.