1. Of spiders who weave circular webs

See also: orb-weaver

• opopanax
• Oporto
• opossum
• opossum rat
• opossum shrimp
• opossum wood
• Oppenheimer
• oppidan
• opponent
• opportune
• opportunely
• opportuneness
• opportunism
• opportunist
• opportunistic
• opportunistic infection
• opportunistically
• opportunity
• opportunity cost
• opposable
• oppose
• opposed
• opposer
• opposing
• opposite