porous portals

A form of porous portal — 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.

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Meanings

noun
  1. pluralplural of porous portal
Cite this entry
APA

porous portals. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/porous%20portals

MLA

“porous portals.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/porous%20portals. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “porous portals,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/porous%20portals.

Source: porous portals on Wiktionary, CC BY-SA 4.0.