superstring

noun
  1. 1

    A hypothetical object consisting of a very small one-dimensional string that vibrates in ten (or more) dimensions

  2. 2

    The string (sequence of text characters) that contains a substring.

    โ€œGiven the superstring "cathode", we can extract the substrings "cat", "hod", and "ode".โ€

Source: https://en.wiktionary.org/wiki/superstring