riser

[rahy-zer]
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.
a.
a heavy strake of planking in the vicinity of the garboard strake in a wooden vessel.
b.
rising ( def 10 ).

Origin:
1350–1400; Middle English; see rise, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
riser (ˈraɪzə)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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