1. Date of the Allied landing in France, World War II
   - D-day

Type of: date, day of the month

• organophosphate nerve agent
• organs
• organum
• organza
• organzine
• orgasm
• orgasmic
• orgiastic
• orgy
• oribi
• orichalc
• orichalcum
• oriel
• oriel window
• orient
• oriental
• oriental alabaster
• Oriental arborvitae
• Oriental beetle
• oriental bittersweet
• Oriental black mushroom
• oriental bush cherry
• oriental cherry
• oriental cockroach
• Oriental garlic