non distributio medii

English

Etymology

From Latin, literally "undistributed middle".

Noun

non distributio medii (uncountable)

1. A logical fallacy that is committed when the middle term in a categorical syllogism isn't distributed.
   • 1932, Albert Jay Nock, The Theory of Education in the United States:

     An educated man must be in some sort instructed; but it is a mere non distributio medii to say that an instructed person must be an educated person.

Further reading

• Fallacy of the undistributed middle on Wikipedia.Wikipedia