| riser | 1. One who rises; as, an early riser. 2. The upright piece of a step, from tread to tread. Hence: Any small upright face, as of a seat, platform, veranda, or the like. 3. <chemical> A shaft excavated from below upward. 4. A feed head. See Feed. Source: Websters Dictionary (01 Mar 1998) |
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| stress riser | A mechanical defect, such as a hole, in bone or other materials that concentrates stress in the area. (05 Mar 2000) |
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| flashboard riser | <ecology> A weir made with removable boards that can be used to adjust the level of water held up behind the weir. (09 Oct 1997) |