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An atrium is a large open space inside a building, often with a high ceiling, sometimes made of glass, letting in a lot of light — you'll see them in modern office buildings, hotels, or shopping malls, usually near the entrance. The word also has a medical meaning: the heart has two atria (that's the plural), the upper chambers of the heart that receive blood before it moves down into the lower chambers.
中庭（建築）；心房（醫學）
組成No clean split; from Latin, meaning the central hall of a Roman house.
原始詞典資料7 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
atriumnoun/ˈeɪ.tɹi.əm/
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architectureA central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
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architectureA square hall lit by daylight from above, into which rooms open at one or more levels.
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anatomymedicinesciencesA cavity, entrance, or passage.
- an atrium of the infundibula of the lungs
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biologynatural-sciencesAny enclosed body cavity or chamber.
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anatomymedicinesciencesAn upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.
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anatomymedicinesciencesA microscopic air sac within a pulmonary alveolus.
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biologychemistrymicrobiologyA cavity inside a porate aperture of a pollen grain formed by the separation of the sexine and nexine layers, widening toward the interior of the grain.
- Nexine 0.5μ thick, separating from the sexine about 5μ from the pore and forming a deep, well-defined atrium.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。