I. -strəl adjective
Etymology: Late Latin magistralis, from Latin magistr-, magister + -alis -al
1. : of, relating to, or characteristic of a master : authoritative , magisterial 1a
the magistral order, accuracy, and clarity of the physical sciences themselves — Lewis Mumford
she has the dignity, the magistral presence, of an heroic figure of tragedy — New Republic
2.
a. : concocted or prescribed by a physician to meet the needs of a particular case — opposed to officinal
b. obsolete : effectual , sovereign
II. noun
( -s )
obsolete : a sovereign medicine