Ris″er (?), n. 1. One who rises; as, an early riser.
2. (Arch.) (a) The upright piece of a step, from tread to tread. Hence: (b) Any small upright face, as of a seat, platform, veranda, or the like.
3. (Mining) A shaft excavated from below upward.
4. (Founding) A feed head. See under Feed, n.