porous portal
porous portal · porous portals
A type of extended and perforated tunnel portal on high-speed railways, designed to…A type of extended and perforated tunnel portal on high-speed railways, designed to reduce the build-up of pressure when a train enters a tunnel at high speed.
Meaning
1 sensesA type of extended and perforated tunnel portal on high-speed railways, designed to reduce the build-up of pressure when a train enters a tunnel at high speed.
Forms
plural: porous portals| Singular | porous portal |
|---|---|
| Plural | porous portals |
regular