creepage

plural creepages

1. countableuncountableA gradual, creeping movement.

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

   1946 January and February, Ralph P. Johnson, “Track and Roadbed for High-Speed Trains”, in Railway Magazine, page 46

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