You searched for: “cruxes
crux (noun); cruxes, cruces (pl)
1. An essential, basic, crucial, or pivotal point.
2. The basic, central, or critical point or feature: "The crux of the matter resulted in a problem for the family."

"The crux of the argument was not resolved."

3. A puzzling or apparently insoluble problem.
This entry is located in the following unit: cruci-, crux (page 2)