vertexes
顶点
顶点
Vertex \
Ver "
tex \,
n .;
pl .
E . {
Vertexes },
L . {
Vertices }. [
L .
vertex , -
icis ,
a whirl ,
top of the head ,
top ,
summit ,
from vertere to turn .
See {
Verse },
and cf . {
Vortex }.]
A turning point ;
the principal or highest point ;
top ;
summit ;
crown ;
apex .
Specifically :
[
1913 Webster ]
(
a ) (
Anat .)
The top ,
or crown ,
of the head .
[
1913 Webster ]
(
b ) (
Astron .)
The zenith ,
or the point of the heavens directly overhead .
[
1913 Webster ]
(
c ) (
Math .)
The point in any figure opposite to ,
and farthest from ,
the base ;
the terminating point of some particular line or lines in a figure or a curve ;
the top ,
or the point opposite the base .
[
1913 Webster ]
Note :
The principal vertex of a conic section is ,
in the parabola ,
the vertex of the axis of the curve :
in the ellipse ,
either extremity of either axis ,
but usually the left -
hand vertex of the transverse axis ;
in the hyperbola ,
either vertex ,
but usually the right -
hand vertex of the transverse axis .
[
1913 Webster ]
{
Vertex of a curve } (
Math .),
the point in which the axis of the curve intersects it .
{
Vertex of an angle } (
Math .),
the point in which the sides of the angle meet .
{
Vertex of a solid },
or {
Vertex of a surface of revolution }
(
Math .),
the point in which the axis pierces the surface .
[
1913 Webster ]
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