1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Promontory \Prom"on*to*ry\, noun; pl. {Promontories}. [ L. promonturium, promunturium; pro before + mons, montis, mountain: cf. F. promontoire. See {Mount}, noun] 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.

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