Mag"is*tral (?), a. [L.
magistralis: cf. F. 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.
Magistral line (Fort.), 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.
Mag"is*tral, n. 1.
(Med.) A sovereign medicine or remedy. [Obs.]
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.