RISER

n. one who rises (especially from bed); vertical board connecting two stair treads; large stair-like platform used during stage performances

In sand casting, a riser prevents shrinkage in metal cast parts during the solidification process. In parachuting, a riser is one of several straps that attach the parachutist's harness to the suspension lines or shroud lines. Parachutes can be steered by pulling on one or more of the risers, to alter the shape of the inflated canopy, although in most modern parachutes, the primary control mechanism is through a pair of steering lines a.k.a. brake lines attached to the left and right trailing edge of the canopy and routed past the left and right rear risers.In plumbing, sewage disposal or fire sprinkler systems, a riser is a pipe leading water upwards from the ground or sea-bed level. In domestic plumbing use, it is a shorter name for a rising main.Similarly, in offshore oil rigs, the riser is used to extend the wellhead from the mudline to the surface.In skateboarding, a riser separates a truck from a deck .In Oil Well Drilling operations, the RISER (a large diameter pipe) connects the BOP, installed on the wellhead on the ocean floor, to the drilling deck of the Oil Platform in Offshore Operations.In computer hardware, a riser raises or changes the angle of PCI, ISA or other interface slots. See also backplane.In structured cabling, the term riser is often used to describe the vertical telecommunications infrastructure in commercial buildings. Copper telecommunications cable extends vertically from the Main Distribution Frame (MDF) to Intermediate Distribution Frame (IDF) generally located on each floor of the building. The space utilized for this cable and the cables themselves are referred to as the riser system.In a bow (weapon), the riser is the central part, or handle, where separate from the limbs.In buildings, the stair riser is a component of steps in a stairway.
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Noun
1. a person who rises (especially from bed); "he's usually a late riser"
(hypernym) person, individual, someone, somebody, mortal, human, soul
(hyponym) early bird
(derivation) get up, turn out, arise, uprise, rise
2. a vertical pipe in a building
(synonym) riser pipe, riser pipeline, riser main
(hypernym) pipe, pipage, piping
3. structural member consisting of the vertical part of a stair or step
(hypernym) structural member
(part-holonym) step, stair

(n.)
The upright piece of a step, from tread to tread.
  

(n.)
One who rises; as, an early riser.
  

(n.)
Any small upright face, as of a seat, platform, veranda, or the like.
  

(n.)
A shaft excavated from below upward.
  

(n.)
A feed head. See under Feed, n.
  

riser /'raizə/
danh từ người dậyan early riser: người (hay) dậy sớma late riser: người (hay) dậy muộn (kiến trúc) ván đứng (giữa hai bậc cầu thang) (kỹ thuật) ống đứng
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