donjon

donjon

noun

the main tower within the walls of a medieval castle or fortress: Synonym: keep dungeon

数据来源：WordNet

1

To the north , Saint-Denis and its spire ; to the west , Saint Cloud and its donjon keep .

北边是圣德尼及其尖顶，西边是圣克鲁及其圆形主塔。
2

The central keep , or donjon , known as the White Tower because of its limestone , was begun c.1078 by William I the Conqueror inside the Roman city wall .

约1078年由征服者威廉一世开始在罗马城墙内侧建造一座中央城楼「白塔」。