riser

Etymology

From Middle English ryser, risere, equivalent to rise + -er.

noun

1. Someone or something which rises.
2. A platform or stand used to lift or elevate something.
   The choir stood on risers for the performance.
3. (carpentry) A vertical part of a step on a staircase.
4. (archery) The main body of a bow.
5. A vertical utility conduit, pipe or path between floors of a building for placement of cables (e.g. telephone, networking), or to convey fluids (e.g. gas, water).
6. A pipe connecting an individual exhaust port of an internal combustion engine to the muffler, particularly on aircraft.
7. A Manx cat with a showable short tail.
8. A strip of webbing joining a parachute's harness to the rigging lines.
9. (Casting (metalworking)) a reservoir built into a metal casting mold to prevent the formation of cavities in the casting as the metal shrinks on cooling.