wiring loom noun2 •A wiring harness; a bundle of wires, tied together but not enclosed in a rigid conduit, that transmit signals or electrical current within a device.Due to the extent of damage to the ceiling panels in the cabin, all the panels were removed and the wiring looms were visually inspected while the aircraft was at Learmonth. No defects were observed. — 2011 •An insulating tube used to bundle individual wires into a wiring harness. formswiring looms