Origin: L. Promonturium, promunturium; pro before + mons, montis, mountain: cf. F. Promontoire. See Mount.

1. <physics> A high point of land or rock projecting into the sea beyond the line of coast; a headland; a high cape. "Like one that stands upon a promontory." (Shak)

2. <anatomy> A projecting part. Especially: The projecting angle of the ventral side of the sacrum where it joins the last lumbar vertebra. A prominence on the inner wall of the tympanum of the ear.

(01 Mar 1998)