O

• Oligophagous
• Omnivore
• Oocyte-flight syndrome
• Operculum
• Opisthosoma
• Oral rim ducts
• Organochlorides
• Organophosphate
• Organotin
• Orifice
• Orthoptera
• Ostioles
• Oviparous
• Ovipositor
• Ovisac
• Oxycarenidae