undistributed middle
noun
Logic.
a middle term of a syllogism that does not refer to its entire class in the major premise or minor premise, with the result that the syllogism is not valid.
Origin of undistributed middle
First recorded in 1820–30
Words nearby undistributed middle
undisputed,
undisputed world champion,
undissociated,
undistinguished,
undistributed,
undistributed middle,
undisturbed,
undivided,
undivided profits,
undo,
undock