cycloid
n . 摆线,轮转线
a . 圆形的,循环性格的
摆线,轮转线圆形的,循环性格的
cycloid adj 1 :
resembling a circle [
synonym : {
cycloid }, {
cycloidal }]
n 1 :
a line generated by a point on a circle rolling along a straight line Cycloid \
Cy "
cloid \ (
s ?"
kloid ),
n . [
Cyclo - -
oid :
cf .
F .
cyclo ["
i ]
de .] (
Geom .)
A curve generated by a point in the plane of a circle when the circle is rolled along a straight line ,
keeping always in the same plane .
[
1913 Webster ]
Note :
The common cycloid is the curve described when the generating point (
p )
is on the circumference of the generating circle ;
the curtate cycloid ,
when that point lies without the circumference ;
the prolate or inflected cycloid ,
when the generating point (
p )
lies within that circumference .
[
1913 Webster ]
Cycloid \
Cy "
cloid \,
a . (
Zool .)
Of or pertaining to the Cycloidei .
[
1913 Webster ]
{
Cycloid scale } (
Zool .),
a fish scale which is thin and shows concentric lines of growth ,
without serrations on the margin .
[
1913 Webster ]
Cycloid \
Cy "
cloid \,
n . (
Zool .)
One of the Cycloidei .
[
1913 Webster ]
Brachystochrone \
Bra *
chys "
to *
chrone \,
n . [
Incorrect for brachistochrone ,
fr .
Gr .
bra `
chistos shortest (
superl .
of brachy `
s short ) ?
time :
cf .
F .
brachistochrone . ] (
Math .)
A curve ,
in which a body ,
starting from a given point ,
and descending solely by the force of gravity ,
will reach another given point in a shorter time than it could by any other path .
This curve of quickest descent ,
as it is sometimes called ,
is ,
in a vacuum ,
the same as the {
cycloid }.
[
1913 Webster ]
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