countertheorem

English

Etymology

counter- +‎ theorem

Noun

countertheorem (plural countertheorems)

1. A theorem formulated in opposition to another.
   • 1960, James Marvin Weller, Stratigraphic Principles and Practice, page 480:

     William Smith's demonstration that similar fossils identify the same formation at different places induced the countertheorem that different fossils indicate formations of different ages.