Final answer:
The term used by J.R.R. Tolkien to describe Jesus's death and resurrection is not directly mentioned in the texts, but previous Christian art refers to it as the 'Anastasis'.
Step-by-step explanation:
The term used by J.R.R. Tolkien to describe Jesus's death and resurrection is not directly mentioned in the provided texts. Previous Christian art has often referred to the concept as the Anastasis, which is Greek for resurrection and refers to both the event and representations of it in Christian art. Similarly, Tolkien's works, while not explicitly mentioning the resurrection of Jesus, can be seen as echoing these themes through various story elements and characters embodying principles of sacrifice, death, and rebirth.