Directrix(redirected from directrices)
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in artillery, a specially equipped sector of an artillery range or troop training center: targets are installed, artillery fire positions and observation points are rigged out, and so on. These sectors are designed for artillery fire (artillery directrix), tank fire (tank directrix), antiaircraft artillery fire against ground targets (antiaircraft artillery directrix), and other weapons.
(of a ruled surface), a curve along which a point on a line moves such that the ruled surface is circumscribed by the motion of the line. Any curve intersecting all the generatrices may be taken as the directrix.