Dictionary.net

• detector that gives a signal when it detects the presence of metal; used to detect the presence of stray bits of metal in food products or to find buried metal

2006 - WordNet 3.0
By Princeton University

• detector that gives a signal when it detects the presence of metal; used to detect the presence of stray bits of metal in food products or to find buried metal

2011 - English Dictionary Database
By DataStellar Co., Ltd