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

• tamper-resistant
• tampers
• Tampico
• Tampico fibre
• tamping
• tampings
• tampion
• tampions
• tampon
• tamponade
• tamponades
• tamponage
• tamponages
• tamponed
• tamponing
• tampons
• tamps
• tams
• tam-tam
• tam-tammed
• tam-tamming
• tam-tams
• Tamulic
• tamworth
• tamworths