a window above a door that is usually hinged to a horizontal crosspiece over the door
同义词：transom, transom window
a window in a roof to admit daylight
同义词：skylight
a semicircular window over a door or window; usually has sash bars like the ribs of a fan
fanlight详细解释
fan.light n.（名词）Architecture A half-circle window, often with sash bars arranged like the ribs of a fan.【建筑学】 扇形窗：门或窗上有扇骨状放射格条的半圆形窗Chiefly British A transom.【多用于英国】 气窗
