Tertium Quid Definition

tûrshē-əm kwĭd, tĕrtē-o͝om
noun
Something of uncertain or unclassifiable nature, related to, but distinct from, two, usually opposite, things.
Webster's New World
A third person or thing of indeterminate character.
American Heritage

Other Word Forms of Tertium Quid

Noun

Singular:
tertium quid
Plural:
tertium-quids

Origin of Tertium Quid

  • Late Latin Latin tertium from neuter of tertius third quid something

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin tertium from tertius, third + quid, thing

    From Wiktionary

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tertium quid