tertium quid

[tur-shee-uhm kwid; Lat. ter-ti-oom kwid] Origin

ter·ti·um quid

[tur-shee-uhm kwid; Lat. 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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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tertium quid is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
tertium quid (ˈtɜːtɪəm ˈkwɪd)
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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