名詞 amphitheater:

1. a sloping gallery with seats for spectators (as in an operating room or theater)
   同義詞：amphitheatre
2. an oval large stadium with tiers of seats; an arena in which contests and spectacles are held
   同義詞：amphitheatre, coliseum

1. One of the passageways of an amphitheater or a stadium leading from the outside wall or passageway to the seats.
   大通道，出入通道圓形劇場或體育館從外墻或通路到座位的幾個通道中的一個

am.phi.the.a.ter

n.（名詞）
An oval or a round structure having tiers of seats rising gradually outward from an open space or arena at the center.
圓形露天劇場：蛋形或圓形建筑，在露天的中央場地周圍有逐漸向外斜上升的階梯式座位
An arena where contests and spectacles are held.
競技場所：舉行比賽或表演的圓形角斗場
A level area surrounded by upward sloping ground.
圓形凹地：陡坡地形所圍住的一片平地
An upper, sloping gallery with seats for spectators, as in a theater or an operating room.
階梯式座位區(qū)：有為觀眾設置的階梯式座位的房間，如劇院和外科手術(shù)室

來源：
Middle English amphitheatre
中古英語 amphitheatre
from Latin amphithe3trum
源自 拉丁語 amphithe3trum
from Greek amphitheatron
源自 希臘語 amphitheatron
amphi- [amphi-]
amphi- [前綴，表.兩邊的.]
theatron [theater] * see theater
theatron [劇院] *參見 theater

【引伸】
am.phitheat.ric
am.phitheat.rically
adv.（副詞）