A high point of land or rock projecting into a body of water. The lighthouse was built on the promontory to guide ships safely to shore.
A prominent mass of land overlooking or projecting into a lowland. From the promontory, we had a breathtaking view of the valley below.
Anatomy: a projecting or bulging part of a bodily structure, especially the anterior projecting part of the first sacral vertebra. The surgeon located the sacral promontory before beginning the procedure.