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ellipsoid

## ellipsoid

```  4  definitions  found

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Ellipsoid  \El*lip"soid\,  n.  [Ellipse  +  -oid:  cf  F.  ellipsoide.]
(Geom.)
A  solid,  all  plane  sections  of  which  are  ellipses  or  circles.
See  {Conoid},  n.,  2
a  .

Note:  The  ellipsoid  has  three  principal  plane  sections,  a,  b,
and  c,  each  at  right  angles  to  the  other  two  and  each
dividing  the  solid  into  two  equal  and  symmetrical
parts  The  lines  of  meeting  of  these  principal  sections
are  the  axes,  or  principal  diameters  of  the  ellipsoid.
The  point  where  the  three  planes  meet  is  the  center.

{Ellipsoid  of  revolution},  a  spheroid;  a  solid  figure
generated  by  the  revolution  of  an  ellipse  about  one  of  its
axes.  It  is  called  a  prolate  spheroid,  or  prolatum,  when
the  ellipse  is  revolved  about  the  major  axis,  and  an
oblate  spheroid,  or  oblatum,  when  it  is  revolved  about  the
minor  axis.

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Ellipsoid  \El*lip"soid\,  Ellipsoidal  \El`lip*soi"dal\,  a.
Pertaining  to  or  shaped  like  an  ellipsoid;  as  ellipsoid  or
ellipsoidal  form

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Conoid  \Co"noid\,  n.  [Gr.  ?  conical;  ?  cone  +  ?  from:  cf  F.
cono["i]de.]
1.  Anything  that  has  a  form  resembling  that  of  a  cone.

2.  (Geom.)
a  A  solid  formed  by  the  revolution  of  a  conic  section
about  its  axis;  as  a  parabolic  conoid,  elliptic
conoid,  etc.;  --  more  commonly  called  {paraboloid},
{ellipsoid},  etc
b  A  surface  which  may  be  generated  by  a  straight  line
moving  in  such  a  manner  as  always  to  meet  a  given
straight  line  and  a  given  curve,  and  continue  parallel
to  a  given  plane.  --Math.  Dict.

From  WordNet  r  1.6  [wn]:

ellipsoid
adj  :  in  the  form  of  an  ellipse  [syn:  {ellipsoidal},  {spheroidal},
{non-circular}]
n  :  a  surface  whose  plane  sections  are  all  ellipses  or  circles;
"the  Earth  is  an  ellipsoid"
```