PETAPETA /ˈpetə/ 
(People for the Ethical Treatment of Animals) a US organization that works to prevent cruelty to animals, known for protesting against vivisection and against people wearing clothes made of fur
(People for the Ethical Treatment of Animals) a US organization that works to prevent cruelty to animals, known for protesting against vivisection and against people wearing clothes made of fur- ornithologist
- ornithology
- Orozco, José
- orphan
- orphanage
- Orpheus and Eurydice
- Orr, Bobby
- Ortega, Daniel
- orthodontic
- orthodontics
- orthodontist
- orthodox
- Orthodox Church
- Orthodox Jew
- orthodoxy
- orthographic
- orthographically
- orthography
- orthopedic
- orthopedically
- orthopedics
- orthopedist
- orthorexia
- orthorexic
- Orton, Joe