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2 definitions found
From:
DICT.TW English-Chinese Dictionary 英漢字典
di·rec·trix
/-ˈrɛktrɪks/
準線
From:
Webster's Revised Unabridged Dictionary (1913)
Di·rect·rix
n.
;
pl
.
E
.
Directrixes
L
.
Directrices
1.
A
directress
. [
R
.]
2.
Geom.
(a)
A
line
along
which
a
point
in
another
line
moves
,
or
which
in
any
way
governs
the
motion
of
the
point
and
determines
the
position
of
the
curve
generated
by
it
;
the
line
along
which
the
generatrix
moves
in
generating
a
surface
.
(b)
A
straight
line
so
situated
with
respect
to
a
conic
section
that
the
distance
of
any
point
of
the
curve
from
it
has
a
constant
ratio
to
the
distance
of
the
same
point
from
the
focus
.
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