apprehension

The Latin verb prehendere really grabs our attention. It means "to grasp" or "to seize," and it is an ancestor of various English words. It teamed up with the prefix ad- (which takes the form ap- before p and means "to," "toward," or "near") to form apprehendere, the Latin predecessor of our words apprehension, apprehend, and apprehensive. When prehendere joined the prefix com- ("with," "together," "jointly"), Latin got comprehendere, and English eventually got comprehend, comprehension, and comprehensive. Prehendere also gave us the words comprise, prehensile ("adapted for seizing or grasping"), prison, reprehend, and reprise, among others.