Available Definitions:
1) n. - One who rises; as, an early riser.
2) n. - The upright piece of a step, from tread to tread.
3) n. - Any small upright face, as of a seat, platform, veranda, or the like.
4) n. - A shaft excavated from below upward.
5) n. - A feed head. See under Feed, n.