phosphodiesterase

[fŏs′fō-dī-ĕstə-rās′, -rāz′]
n.
  1. Any of a class of enzymes that catalyze the cleaving of phosphodiester bonds, such as those between nucleotides in nucleic acids, to produce smaller nucleotide units or mononucleotides but not inorganic phosphate.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.