riser

[rahy-zer] /ˈraɪ zər/
noun
1.
a person who rises, especially from bed:
to be an early riser.
2.
the vertical face of a stair step.
3.
any of a group of long boards or narrow platforms that can be combined in stepwise fashion:
The choir stood on a horseshoe of risers behind the orchestra.
4.
a vertical pipe, duct, or conduit.
5.
Metallurgy. a chamber or enlarged opening at the top of a mold for allowing air to escape or adding extra metal.
6.
Nautical.
  1. a heavy strake of planking in the vicinity of the garboard strake in a wooden vessel.
  2. rising (def 10).
Origin
1350-1400; Middle English; see rise, -er1
Examples from the web for riser
  • He was an early riser, and a great friend of hunting.
  • Rather, the additional seats attached to standards that were bolted to a riser below the primary seat.
  • So if you're an early riser or a certified insomniac, you're in business.
  • When the rig sank, the riser tore loose and collapsed to the sea floor.
  • Oil is currently escaping from two leaks, one at each end of the well's riser.
  • Many guests are surprised to learn that all water pipes in our system run off a single riser.
  • She kept completely different hours from her husband, who was an early riser.
  • She has a reputation for being blunt-spoken, but also for being a politically connected fast-riser.
  • Unfortunately, one of the steps and one riser have large rust stains.
  • Fall is a great time for a photographer to be an early riser.
British Dictionary definitions for riser

riser

/ˈraɪzə/
noun
1.
a person who rises, esp from bed: an early riser
2.
the vertical part of a stair or step
3.
a vertical pipe, esp one within a building
Word Origin and History for riser
n.

late 14c., "rebel," agent noun from rise (v.). Meaning "one who rises" (from bed, in a certain manner) is mid-15c. Meaning "upright part of a step" is from 1771.