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## spiral

```  3  definitions  found

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

Spiral  \Spi"ral\,  n.  [Cf.  F.  spirale.  See  {Spiral},  a.]
1.  (Geom.)  A  plane  curve,  not  re["e]ntrant,  described  by  a
point,  called  the  generatrix,  moving  along  a  straight  line
according  to  a  mathematical  law,  while  the  line  is
revolving  about  a  fixed  point  called  the  pole.  Cf
{Helix}.

2.  Anything  which  has  a  spiral  form  as  a  spiral  shell.

{Equiangular  spiral},a  plane  curve  which  cuts  all  its
generatrices  at  the  same  angle.  Same  as  {Logarithmic
spiral},  under  {Logarithmic}.

{Spiral  of  Archimedes},  a  spiral  the  law  of  which  is  that  the
generatrix  moves  uniformly  along  the  revolving  line  which
also  moves  uniformly.

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

Spiral  \Spi"ral\,  a.  [Cf.  F.  spiral.  See  {Spire}  a  winding
line.]
1.  Winding  or  circling  round  a  center  or  pole  and  gradually
receding  from  it  as  the  spiral  curve  of  a  watch  spring.

2.  Winding  round  a  cylinder  or  imaginary  axis,  and  at  the
same  time  rising  or  advancing  forward;  winding  like  the

3.  (Geom.)  Of  or  pertaining  to  a  spiral;  like  a  spiral.

{Spiral  gear},  or  {Spiral  wheel}  (Mach.),  a  gear  resembling
in  general  a  spur  gear,  but  having  its  teeth  cut  at  an
angle  with  its  axis,  or  so  that  they  form  small  portions
of  screws  or  spirals.

{Spiral  gearing},  a  kind  of  gearing  sometimes  used  in  light
machinery,  in  which  spiral  gears,  instead  of  bevel  gears,
are  used  to  transmit  motion  between  shafts  that  are  not
parallel.

{Spiral  operculum},  an  operculum  whih  has  spiral  lines  of
growth.

{Spiral  shell},  any  shell  in  which  the  whorls  form  a  spiral
or  helix.

{Spiral  spring}.  See  the  Note  under  {Spring},  n.,  4.

From  WordNet  r  1.6  [wn]:

spiral
adj  :  in  the  shape  of  a  coil  [syn:  {coiling},  {helical},  {spiraling},
{volute},  {voluted},  {whorled},  {turbinate}]
n  1:  a  plane  curve  traced  by  a  point  circling  about  the  center
but  at  ever-greater  distances  from  it
2:  a  curve  that  lies  on  the  surface  of  a  cylinder  or  cone  and
cuts  the  element  at  a  constant  angle  [syn:  {helix}]
3:  a  curve  on  a  plane  that  winds  around  a  center  with  an
increasing  distance  from  the  center  [syn:  {volute}]
4:  something  wound  in  a  continuous  series  of  loops;  "a  coil  of
rope"  [syn:  {coil},  {volute},  {whorl},  {helix}]
5:  flying  downward  in  a  helical  path  with  a  large  radius
v  1:  to  wind  or  move  in  a  spiral  course:"  the  muscles  and  nerves
of  his  fine  drawn  body  were  coiling  for  action,",  "black
smoke  coiling  up  into  the  sky";  "the  young  people
gyrated  on  the  dance  floor"  [syn:  {gyrate},  {coil}]
2:  form  a  spiral;  "The  path  spirals  up  the  mountain"
3:  move  in  a  spiral  or  zigzag  course  [syn:  {corkscrew}]
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