DNA probe
n. 1. a laboratory-produced quantity of a known segment of labeled DNA that is used for finding matching DNA in a biological sample, as blood or hair, by the base-pairing of strands from both sources.
2. a search or examination with such a DNA segment.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.