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 quidPlural:
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