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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 of riser
1350-1400
1350-1400; Middle English; see rise, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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5
5
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