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

• gold rushes
• golds
• goldsinny
• goldsize
• goldsizes
• goldsmith
• goldsmith beetle
• goldsmith beetles
• goldsmithery
• goldsmithries
• goldsmithry
• goldsmiths
• goldspink
• goldspinks
• gold standard
• gold standards
• goldstick
• goldsticks
• goldstone
• goldstones
• gold thread
• gold-washer
• gold-washers
• gold-wasp
• gold-wasps