trollius/ʹtroli·əs/ noun (pl trollius)

• ordinal
• ordinal number
• ordinance
• ordinand
• ordinary
• Ordinary grade
• Ordinary level
• ordinary seaman
• ordinary share
• ordinate
• ordination
• ordnance
• ordnance datum
• Ordnance Survey
• ordonnance
• Ordovician
• ordure
• ore
• oread
• Oreg
• oregano
• or else
• orfe
• org.
• organ