memento /mi-menˈtō/

1. Something kept or given as a reminder
2. A fit of reverie (obsolete)

memento mori /mōˈrī or moˈrē/ noun (Latin)

1. Remember that you must die
2. Anything (eg a skull) to remind one of mortality

• orpin
• orpine
• orpines
• Orpington
• orpins
• ORR
• orra
• orra man
• orra men
• or rather
• orreries
• orrery
• orris
• orrises
• orris-root
• ors
• orseille
• orsellic
• or so
• ort
• ORT
• ortanique
• ortaniques
• orth-
• orthian