a connector used to pass a conductor through a circuit board or enclosure.
Origin of feedthrough
noun use of verb phrase feed through
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
electronics a conductor used to connect two sides of a part, such as a printed circuit board
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012