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Riser

From Biology-Online Dictionary | Biology-Online Dictionary
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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. (Science: chemical) A shaft excavated from below upward.

4. A feed head. See Feed.