n.; pl. Promontories [ L. promonturium, promunturium; pro before + mons, montis, mountain: cf. F. promontoire. See Mount, n. ] [ 1913 Webster ] 1. (Phys. Geog.) A high point of land or rock projecting into the sea beyond the line of coast; a headland; a high cape. [ 1913 Webster ] Like one that stands upon a promontory. Shak. [ 1913 Webster ] 2. (Anat.) A projecting part. Especially: (a) The projecting angle of the ventral side of the sacrum where it joins the last lumbar vertebra. (b) A prominence on the inner wall of the tympanum of the ear. [ 1913 Webster ] | 