magistral

Etymology

From French magistral, and its source, Latin magistrālis, from magister (“master”). Doublet of mistral.

adj

1. Pertaining to or befitting a master; authoritative.
   [Y]ou live on a magistral hill in a venerable mansion, not to speak of governmental rations. 1928, Hart Crane, letter, 16 September
   Toby opened the game with a magistral flourish. 1982, Lawrence Durrell, Constance (Avignon Quintet), Faber & Faber, published 2004, page 889
2. (obsolete, pharmacology) Sovereign (of a remedy); extremely effective.
3. (pharmacology) Formulated extemporaneously, or for a special case; opposed to officinal, and said of prescriptions and medicines.

noun

1. (pharmacology) A sovereign medicine or remedy.
2. (countable) A magistral line.
3. (chiefly uncountable) Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America.