creepage

creep +‎ -age

creepage (countable and uncountable, plural creepages) .

1. A gradual, creeping movement.
   • 1946 January and February, Ralph P. Johnson, “Track and Roadbed for High-Speed Trains”, in Railway Magazine, page 46:

     Therefore, when preparing and maintaining track for high speeds, the importance of ample anchorage against creepage cannot be overlooked.

2. The leakage of an electrical current across the surface of an insulator (dielectric)

• creepage distance