| n. | 1. | One who rises; |
| 2. | (Arch.) The upright piece of a step, from tread to tread. | |
| 3. | (Mining) A shaft excavated from below upward. | |
| 4. | (Founding) A feed head. See under Feed, |
| Noun | 1. | riser - a person who rises (especially from bed); "he's usually a late riser" |
| 2. | riser - a vertical pipe in a building | |
| 3. | riser - structural member consisting of the vertical part of a stair or step |