tun·nel·ing 
(tŭnə-lĭng)
(tŭnə-lĭng)n.
In quantum mechanics, the passing of a particle through a seemingly impenetrable barrier without a cause that is explainable by classical physics.
- polyamory
- polyandrous
- polyandry
- polyanthus
- polyaramid fiber
- polyatomic
- polybasic
- polybasite
- Polybius
- polycarbonate
- Polycarp
- polycarpic
- polycarpous
- polycarpy
- polycentric
- polycentrism
- polychaete
- polychaetous
- polychlorinated biphenyl
- polychromatic
- polychromatophile
- polychromatophilia
- polychromatophilic
- polychrome
- polychromic