portal

Taking a big golden key from a peg on the wall, he opened another gate, and they all followed him through the portal into the streets of the Emerald City.

Neither did he appear to have pursued any course of reading which might fit him for a degree in science or any other recognized portal which would give him an entrance into the learned world.

Through the closing portal,

This door was a mockery to the concierge, from whose vigilance and jurisdiction it was free, and, like that famous portal in the Arabian Nights, opening at the “Sesame” of Ali Baba, it was wont to swing backward at a cabalistic word or a concerted tap from without from the sweetest voices or whitest fingers in the world.