replisome

[rĕplĭ-sōm′]
n.
  1. Any of the sites on the matrix of a cell nucleus that contains a series of enzyme complexes in which DNA replication is considered to occur.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.