1. (of a liquid) agitated vigorously; in a state of turbulence
   - churning, roiling, roiled, turbulent

See also: agitated

• Oort cloud
• oosphere
• oospore
• ootid
• ooze
• ooze leather
• ooze out
• ooze through
• oozing
• oozy
• op
• op art
• op shop
• op-ed
• op. cit.
• opacification
• opacify
• opacity
• opah
• opal
• opal glass
• opalesce
• opalescence
• opalescent
• opaline