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From: Webster's Revised Unabridged Dictionary (1913)

 Prom·on·to·ry n.; pl. Promontories
 1. Phys. Geog. 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. 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.