per an.

Per annum (see per²)

• orthokeratology
• orthologous
• orthologue
• orthologues
• orthomorphic
• orthopaedic
• orthopaedical
• orthopaedically
• orthopaedics
• orthopaedist
• orthopaedists
• orthopaedy
• orthopedia
• orthopedic
• orthopedical
• orthopedically
• orthopedics
• orthopedist
• orthopedists
• orthopedy
• orthopharynges
• orthophosphate
• orthophosphates
• orthophosphoric
• orthophyre