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Directrix
Noun
Image:Eccentricity.svg|thumb|In this picture of an
ellipse
, a
parabola
, and an
directrix
(
plural
directrices
)
A
female
who
direct
s; a
directress
.
(
geometry
) A
line
used to
define
a
curve
or
surface
; especially a line, the
distance
from which a point on a
conic
has a constant
ratio
to that from the
focus
.
Derived terms
conic section directrix
graph directrix
ruled surface directrix
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