n.

1. 【天】半影（日、月蚀或太阳黑子周围的半暗部）
2. （绘画）浓淡相交处
3. 暧昧的部分

n.

1. the partially shaded outer region of the shadow cast by an opaque object, especially the area of the earth or moon experiencing a partial eclipse.
2. Astronomy  the less dark outer part of a sunspot.