- One who rises; as, an early riser. - The upright piece of a step, from tread to tread. - Any small upright face, as of a seat, platform, veranda, or
the like. - A shaft excavated from below upward. - A feed head. See under Feed, n.
Meaning of 'riser' (Princeton's WordNet)
1 . riser
[ n]
Meaning (1): - a person who rises (especially from bed)