Webster's English Dictionary

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vertex

ver.tex \'v*r-.teks\ \'v*rt-*-.se-z\ n or ver.tex.es or ver.ti.ces [L 
   vertic, vertex, vortic-, vortex whirl, whirlpool, to] pl p of the head, 
   summit, fr. vertere to turn 1a1: the point opposite to and farthest from 
   the base in a figure  1a2: the termination or intersection of lines or 
   curves  1b: ZENITH  2: the top of the head  3: a principal or highest point 
   : SUMMIT, APEX {a monument  on the ~ of the hill}