释义
n.
something crescent-shaped, in particular
月牙形的物体，尤指：
an arched aperture or window, especially one in a domed ceiling
（尤指在建筑物穹顶上的）弧形空间；弧形窗。
a crescent-shaped or semicircular alcove containing something such as a painting or statue
（内有画或雕像的）新月形（或半圆形）壁龛。
a fortification with two faces forming a projecting angle, and two flanks
眼镜堡。
【基督教】 （圣体匣中搁圣体的）圣体托架。
a ring fixed to a vehicle, by which it can be towed
（车辆的）牵引环。
词源
"late 16th cent. （denoting a semicircular horseshoe）： from French, diminutive of