Other forms: stairwells
A stairwell is the vertical shaft that holds a staircase. Down the stairwell, echo in the stairwell, a concrete stairwell.
It is the space rather than the stairs themselves, which is why voices echo in one. In a tall building the stairwell is pressurised and fire-rated so that it stays clear of smoke, since it is the escape route when the lifts stop.
1nounstairwellThe vertical shaft that holds a staircase.
“The fire alarm went off, and we all hurried down the stairwell.”
stairwell is a shaft.
From stair + well.
Etymology from Wiktionary, CC BY-SA