Definition of mid-square in English:

mid-square

adjective

Mathematics
  • Designating a method of generating a pseudorandom sequence of digits by squaring an arbitrary large number, taking the middle digits of the result (usually half the total number of digits, a zero being added at the left if necessary to make the total even), and using these as the first digits of the sequence and as the number to be squared to provide the next digits, and so on.

Origin

1920s (in an earlier sense). From mid + square.

Pronunciation

mid-square

/ˌmɪdˈskwɛː/