Leak

Hole, porosity, permeable element or other structure in the wall of an object allowing gas to pass from one side of the wall to the other by the effect of pressure- or concentration-difference across the wall.
ISO 20484:2017(E)

Сквозной дефект (3.2.3)
Течь (3.2.4)

ГОСТ Р «Контроль неразрушающий. Течеискание. Термины и определения»