Also from –

Railroads . an enclosed space at the end of a passenger car, serving as a sheltered entrance to the car from another car or from outside the train.

Anatomy, Zoology . any of various cavities or hollows regarded as forming an approach or entrance to another cavity or space, as that of the internal ear.

Seems like this word is a multi-purpose word but strangely enough during everyday conversations, I have not heard of this word being used before. Time to utilise it!