riser

[ rahy-zer ]
/ ˈraɪ zər /

noun

a person who rises, especially from bed: to be an early riser.
the vertical face of a stair step.
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.
a vertical pipe, duct, or conduit.
Metallurgy. a chamber or enlarged opening at the top of a mold for allowing air to escape or adding extra metal.
Nautical.
  1. a heavy strake of planking in the vicinity of the garboard strake in a wooden vessel.
  2. rising (def. 10).

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Origin of riser

Middle English word dating back to 1350–1400; see origin at rise, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for riser

British Dictionary definitions for riser

riser
/ (ˈraɪzə) /

noun

a person who rises, esp from bedan early riser
the vertical part of a stair or step
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