riser

[rahy-zer]

ris·er

[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.
EXPAND
6.
Nautical.
a.
a heavy strake of planking in the vicinity of the garboard strake in a wooden vessel.
b.
rising (def. 10).
COLLAPSE

Origin:
1350–1400; Middle English; see rise, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Riser is always a great word to know.
So is friction. Does it mean:
surface resistance to relative motion, as of sliding or rolling.
says square of period of any planet is proportional to cube of semimajor axis of its orbit
Collins
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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