1. Referring back to itself
   - reflexive

See also: backward

• osteosarcoma
• osteosclerosis
• osteosclerosis congenita
• osteostracan
• Osteostraci
• osteotomy
• ostiarius
• ostiary
• ostinato
• ostiole
• ostium
• ostler
• Ostmark
• ostomy
• Ostraciidae
• ostracise
• ostracism
• ostracize
• ostracod
• Ostracoda
• ostracoderm
• Ostracodermi
• Ostrava
• Ostrea
• Ostrea gigas