Depicted in or possessing the form of a beast.
Etymology: late 1800s, Greek, therion, wild animal + morphe, shape
The word is most often used in reference to theriomorphic gods,
but I saw it here:
"His understanding of animal communication and display patterns was revelatory. When he spoke about fish, his hands became fins, when he talked about wolves is eyes were those of a predator, and when he told tales about his geese his arms bcame wings tucked into his sides. He wasn't athropomorphic, he was the opposite - theriomorphic - he became the animal he was describing."
- Frans de Waal, Are We Smart Enough to Know How Smart Animals Are?