- In an irregular polygon, an interior angle that is greater than 180° and whose apex faces into the polygon.凹角：在不规则多边形中超过180度，而且其顶点指向多边形内部的内角
- white bear
- White Bear Lake
- white birch
- white blood cell
- white blood corpuscle
- whiteboard
- whiteboards
- white book
- white bread
- white-bread
- white bryony
- whitecap
- white cedar
- white cell
- white cell
- White Center
- white chip
- white chocolate
- white cloud
- white clover
- white-collar
- white corpuscle
- white corpuscle
- white crab
- white crappie