tertium quid

[tur-shee-uhm kwid; Latin ter-ti-oom kwid]
something related in some way to two things, but distinct from both; something intermediate between two things.

1715–25; < Latin, translation of Greek tríton·ti some third thing

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World English Dictionary
tertium quid (ˈtɜːtɪəm ˈkwɪd)
an unknown or indefinite thing related in some way to two known or definite things, but distinct from both: there is either right or wrong, with no tertium quid
[C18: from Late Latin, rendering Greek triton ti some third thing]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

tertium quid
1724, from L., lit. "third something," loan-translation of Gk. triton ti (Plato), used in alchemy for "unidentified element present in a combination of two known ones."
Online Etymology Dictionary, © 2010 Douglas Harper
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