noun a feed head. ·see under feed, ·noun.
2. riser ·noun one who rises; as, an early riser.
3. riser ·noun a shaft excavated from below upward.
4. riser ·noun the upright piece of a step, from tread to tread.
5. riser ·noun any small upright face, as of a seat, platform, veranda, or the like.