halloo/həʹlooh/ interj, noun, and verb (hallooing, hallooed, pl halloos)

• own up
• owt
• ox
• ox-
• oxalate
• oxalic acid
• oxalis
• oxbow
• oxbow lake
• Oxbridge
• oxen
• oxer
• oxeye daisy
• Oxford
• Oxford bags
• Oxford blue
• Oxford movement
• oxidant
• oxidation
• oxidation number
• oxidation state
• oxide
• oxidize
• oxidizing agent
• oxlip