tertium quid

ter·ti·um quid

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

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

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World English Dictionary
tertium quid (ˈtɜːtɪəm ˈkwɪd) [Click for IPA pronunciation guide]
 
n
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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00:10
Tertium quid is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
Etymonline
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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