Magistral

Pertaining to a master; magisterial; authoritative; dogmatic.

Commanded or prescribed by a magister, esp. by a doctor; hence, effectual; sovereign; as, a magistral sirup.

Formulated extemporaneously, or for a special case; -- opposed to officinal, and said of prescriptions and medicines.

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.