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

• triaxial
• triaxials
• triaxon
• triaxons
• triazine
• triazines
• triazole
• triazoles
• tribade
• tribades
• tribadic
• tribadies
• tribadism
• tribadisms
• tribady
• tribal
• tribalism
• tribalisms
• tribalist
• tribalistic
• tribalists
• tribally
• tri-band
• tribasic
• tribble