1. Soil bacteria that convert nitrites to nitrates
   - nitrobacteria

Type of: eubacteria, eubacterium, true bacteria

Part of: genus Nitrobacter, Nitrobacter

• 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
• opposite number
• opposite word