view·er 
(vyər)
(vyər)n.
1. One that views, especially an onlooker or spectator.
2. Any of various optical devices used to facilitate the viewing of photographic transparencies by illuminating or magnifying them.
3. A person who watches television or movies: viewers of prime-time shows; viewers of action movies.
- partially
- partialness
- partial pressure
- partial seizure
- partial tone
- partible
- participance
- participant
- participate
- participation
- participational
- participative
- participator
- participatory
- participial
- participially
- participle
- particle
- particle accelerator
- particle beam
- particleboard
- particle board
- particle decay
- particle physics
- parti-colored