IPA: /ˈslɪtiər/
KK: /ˈslɪtɪər/
More slitty than something else; having more slits or openings.
The slittier design of the new model allows for better airflow.
The word 'slittier' is derived from 'slit' (from Old English 'slitan', meaning to split or tear) and the comparative suffix '-ier' (indicating more). Therefore, 'slittier' means more split or torn than something else.
Think of something that is 'more split' or 'more torn' — 'slit' refers to the act of splitting, and '-ier' shows that it is in a greater degree.