The Collaborative International Dictionary of English v.0.48:

DNA polymerase \DNA polymerase\ (d[=e]`[e^]n*[=a]"
   p[o^]*l[i^]m"[~e]r*[=a]s) n. (Biochemistry, Genetics)
   an enzyme that catalyzes the formation of DNA from
   deoxyribonucleoside triphosphates. Cells contain several
   types of DNA polymerase, some of which are required for
   replication of DNA, and are indispensable for multipliation
   and division of cells.
   [PJC] DNase

WordNet (r) 3.0 (2006):

DNA polymerase
    n 1: the enzyme responsible for DNA replication