aporia /a-pōˈri-a or -pöˈ/

1. A professed doubt of what to say or to choose (rhetoric)
2. A difficulty

• oncost
• oncostman
• oncostmen
• oncosts
• oncotomies
• oncotomy
• on course
• on cue
• oncus
• OND
• ondansetron
• ondatra
• ondatras
• on demand
• Ondes Martenot
• ondes Martenot
• ondes musicales
• ondine
• onding
• ondings
• on-dit
• on-dits
• on draught
• on drive
• on-drive