2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Vertex  \Ver"tex\,  n.;  pl  {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: 
  a  (Anat.)  The  top  or  crown,  of  the  head. 
  b  (Anat.)  The  zenith,  or  the  point  of  the  heavens  directly 
  overhead. 
  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. 
 
  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. 
 
  {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  {of  a  surface  of  revolution}  (Math.), 
  the  point  in  which  the  axis  pierces  the  surface. 
 
  From  WordNet  r  1.6  [wn]: 
 
  vertex 
  n  1:  the  point  of  intersection  of  lines  or  the  point  opposite  the 
  base  of  a  figure 
  2:  the  highest  point  of  something  [syn:  {peak},  {apex},  {acme}] 

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