Mag″is‐tral, n. 1. (Med.) A sovereign medicine or remedy. Burton.
2. (Fort.) A magistral line.
3. (Metal.) Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.