There are several terms that describe desert plants like cacti, but the most common and accurate one is xerophyte.

Here's why:

* Xerophyte specifically refers to a plant adapted to survive in arid environments with low water availability. Cacti are excellent examples of xerophytes due to their adaptations like water storage, reduced leaf surface area, and deep root systems.

* Succulent is another term that applies to cacti, as they have fleshy tissues for storing water. However, not all succulents are xerophytes, and some are found in other environments.

* Desert plant is a broad term that encompasses any plant found in a desert, but it doesn't necessarily imply specific adaptations.

Therefore, xerophyte is the most accurate and specific term for describing a desert plant like cactus.