The Collaborative International Dictionary of English v.0.48:

Isolated \I"so*la`ted\ ([imac]"s[-o]*l[=a]`t[e^]d), a.
   Placed or standing alone; detached; separated from others.
   [1913 Webster]

   Isolated point of a curve. (Geom.) See Acnode.
      [1913 Webster]