A sovereign medicine or remedy.
A magistral line.
Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America.
Pertaining to or befitting a master; authoritative.
(pharmaceutical effect) Sovereign (of a remedy); extremely effective.
Formulated extemporaneously, or for a special case; opposed to officinal, and said of prescriptions and medicines.