1. The first Sunday in Lent
   - Quadragesima

Type of: Christian holy day

• osprey
• ossein
• osseous
• osseous labyrinth
• osseous tissue
• Ossete
• Ossi
• ossia
• ossicle
• ossicular
• ossiculate
• ossiculum
• ossiferous
• ossification
• ossified
• ossifrage
• ossify
• osso buco
• ossuary
• Ostariophysi
• osteal
• Osteichthyes
• osteitis
• osteitis deformans
• ostend