Etymology of the Latin word amphitheatrum
the Latin word amphitheatrum (amphitheater, double theater having stage)
derived from the Greek word amphitheatron, ἀμφιθέατρον
using the Greek prefix amphi-, ἀμφι-, ἀμϕι-
derived from the Greek word theatron, θέατρον (a place for public show ('theatre'); general audience-room; by implication, a show itself)
derived from the Greek word theasthai, θεᾶσθαι
derived from the Greek word thea, θεά (a female deity)
derived from the Greek word theaomai, θεάομαι (to look closely at; perceive ; by extension to visit; to look closely at; perceive; by extension to visit)