trioxide /trī-okˈsīd/ (chem)

A compound with three atoms of oxygen

• on record
• on remand
• on request
• onrush
• onrushes
• ons
• ONS
• on schedule
• on-screen
• on second thoughts
• onset
• onsets
• onsetter
• onsetters
• onsetting
• onsettings
• on shaky ground
• on shipboard
• on shore
• on-shore
• onshore
• onside
• onsides
• on sight
• on-site