eye·wit·ness 
(īwĭtnĭs)
(īwĭtnĭs)n.
A person who has seen someone or something and can bear witness to the fact.
- apoplexy
- apoptosis
- aporia
- aport
- aposematic coloration
- aposiopesis
- aposiopetic
- aposporic
- aposporous
- apospory
- apostasy
- apostate
- apostatize
- a posteriori
- apostle
- apostlehood
- "Apostle of the English."
- Apostles' Creed
- apostleship
- apostolate
- apostolic
- apostolical
- apostolically
- apostolic delegate
- Apostolic Father