niggerhead
/ˈnɪgəhed/noun
chiefly N. Amer. & NZ <主北美, 主新西兰>
1
- a tangled mass of the roots and decayed remains of sedges projecting from a swamp（沼泽里突起的）盘根腐草。
2
- a rounded rock, stone, or coral, especially a black one（尤指黑色的球形）岩石; 石头; 珊瑚。
3
- mass noun strong black tobacco烈性黑烟草。