farden or farding /färˈdən/ (obsolete or dialect) same as farthing

• operculated
• operculum
• opere citato
• operetta
• operettas
• operettist
• operettists
• operon
• operons
• operose
• operosely
• operoseness
• operosenesses
• operosities
• operosity
• ophi-
• ophicalcite
• ophicalcites
• ophicleide
• ophicleides
• Ophidia
• ophidian
• ophidians
• ophidiaria
• ophidiarium