horseradish peroxidase: Meaning and Definition of

horse'radish perox'idase

Pronunciation: [key]
  1. an enzyme, isolated from horseradish, that when microinjected can be detected by the colored products of the reaction it catalyzes, used as a tracer, as in tracing the route of a motor neuron from the cell body in the spinal cord to the muscle it innervates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.