1. The ordinal number of one hundred fifty-five in counting order
   - hundred-and-fifty-fifth

See also: ordinal

• oxidize
• oxidized
• oxidized LDL cholesterol
• oxidizer
• oxidizing agent
• oxidoreductase
• oxidoreduction
• oxime
• oximeter
• oxlip
• Oxonian
• oxtail
• oxtail soup
• oxtant
• oxter
• oxtongue
• oxyacetylene
• oxyacetylene torch
• oxyacid
• Oxybelis
• oxybenzene
• oxybutyric acid
• oxycephaly
• oxycodone
• Oxydendrum