Persisting or continuing notwithstanding resistance, warning, remonstrance, etc.; refusing to cease or give-up some action, course, or goal; perservering: because, a persistent beggar; persistent attempts to take action.
That endures; suffering.
Specifically— In botany, continuing without withering: opposed to caducous, deciduous, or marcescent: as, a persistent calyx (one remaining following the corolla features withered).
In zoology, perennial; keeping to morphological personality, or continuing in useful task; perhaps not degenerate, deciduous, or caducous, as a component or an organ: as, persistent forms of framework; the persistent horns of cattle or gills of newts.