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promontory (n.)

"high point of land or rock projecting into the sea beyond the line of a coast," 1540s, from French promontoire (15c.) and directly from Medieval Latin promontorium, altered (by influence of Latin mons "mount, hill") from Latin promunturium "mountain ridge, headland," which is probably related to prominere "jut out" (see prominent). Related: Promontorial; promontorious.

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Definitions of promontory from WordNet

promontory (n.)
a natural elevation (especially a rocky one that juts out into the sea);
Synonyms: headland / head / foreland
From wordnet.princeton.edu