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The Collaborative International Dictionary
Prunella salt

Prunella \Pru*nel"la\, n. [NL., perhaps from G. br[ae]une quinsy, croup.] (Med.)

  1. Angina, or angina pectoris.

  2. Thrush.

    Prunella salt (Old Chem.), niter fused and cast into little balls.

Wiktionary
prunella salt

n. (context chemistry obsolete English) nitre fused and cast into little balls