1. Not affiliated in a trade union
   - unorganized, unorganised [Brit], nonunionized

See also: nonunion

• ophthalmia neonatorum
• ophthalmic
• ophthalmic artery
• ophthalmic vein
• ophthalmitis
• ophthalmologist
• ophthalmology
• ophthalmoplegia
• ophthalmoscope
• ophthalmoscopy
• opiate
• Opiliones
• opine
• opinion
• opinion poll
• opinionated
• opinionative
• opioid
• Opisthobranchia
• Opisthocomidae
• Opisthocomus
• Opisthocomus hoazin
• Opisthognathidae
• opisthognathous
• opisthorchiasis