Second sense: natural as what every appetite seeks
Again, what each thing's appetite naturally tends toward is called natural. In this sense too he grants that immortality is natural to man and death against nature, because everyone by nature longs for immortality and shrinks from death.
Latin
XV. Item naturale dicitur id in quod naturaliter fertur cujusque appetitus. Et etiam sic concedit immortalitatem homini naturalem esse, & mortem contra naturam, quoniam omnes natura appetunt immortalitatem, mortem vero refugiunt.