a semicircular window over a door or window; usually has sash bars like the ribs of a fan
a window in a roof to admit daylight 同义词：skylight,
a window above a door that is usually hinged to a horizontal crosspiece over the door 同义词：transom, transom window,
A fanlight is a window, semicircular or semi-elliptical in shape, with glazing bars or tracery sets radiating out like an open fan. It is placed over another window or a doorway, and is sometimes hinged to a transom.
例句与用法
1.
Alter a lapse of four minutes the glimmer of his candle was discernible through the semitransparent semicircular glass fanlight over the halldoor 过了四分钟，隔着厅门上端那半透明的扇形气窗，他那忽隐忽现的烛光映入眼帘。
2.
He advanced several paces towards the point whence the light came , and to all the excitement of his dream succeeded the calmness of reality . he found that he was in a grotto , went towards the opening , and through a kind of fanlight saw a blue sea and an azure sky . the air and water were shining in the beams of the morning sun ; on the shore the sailors were sitting , chatting and laughing ; and at ten yards from them the boat was at anchor , undulating gracefully on the water 他向光线透进来的那个地方走前几步，在梦的兴奋激动过后，跟着就来了现实的宁静，发觉自己是在一个岩洞里，他向洞口走去，透过一座拱形的门廊，他看到一片蔚蓝色的海和一片淡青色的天空，空气和海水在清晨的阳光里闪闪发光，水手们坐在海滩上，在那儿叽哩咕噜地谈笑着，离他们十码远的地方，静静的停着那艘小船。
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