tertium quid /tûrˈsh(i-)əm kwid or terˈti-ŭm/)

1. A third unknown thing related to two specific known things
2. Something intermediate between opposites
3. The third person in the eternal triangle

• cotinga
• cotingas
• Cotingidae
• cotinine
• cotinines
• cotise
• cotised
• cotises
• cotising
• cotland
• cotlands
• cotoneaster
• cotoneasters
• cotquean
• cotqueans
• co-trimoxazole
• cots
• Cotswold
• Cotswold lion
• cott
• cotta
• cottabus
• cottabuses
• cottage
• cottage cheese