Webster's Revised Unabridged Dictionary · 1913

Magistral

Magistral , adjective

[Latin magistralis: compare French magistral. See Magistrate.]

1.
Pertaining to a master; magisterial; authoritative; dogmatic.
2.
Commanded or prescribed by a magister, esp. by a doctor; hence, effectual; sovereign; as, a magistral sirup.
Some magistral opiate. — Bacon
3.
(Pharmacy) Formulated extemporaneously, or for a special case; -- opposed to officinal, and said of prescriptions and medicines. — Dunglison
Collocations (1)
Magistral line (Fortification) , the guiding line, or outline, by which the form of the work is determined. It is usually the crest line of the parapet in fieldworks, or the top line of the escarp in permanent fortifications.

Magistral , noun

1.
(Medicine) A sovereign medicine or remedy. [Obsolete] — Burton
2.
(Fortification) A magistral line.
3.
(Metallurgy) Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America.