A staircase descender is a chair (like a wheelchair) that has a flat back. The flat back can be pulled down to lay flat (like a stretcher) and the ambulance team can take a person from one level to the next by sliding the descender. Sydney Staircase Builders

slender descender

There are a couple verbs that can mean "to descend": descender , bajar.

Fear Factor - 2001 Descender Jump Sheep's Eye Water Tank 1-7 was released on:

USA: 23 July 2001

A descender in cursive handwriting refers to the part of a letter that goes below the baseline of the writing line. Letters such as "g", "y", and "q" typically have descenders in cursive handwriting. Descenders add variation to the letters and help with the overall flow and aesthetics of the writing.