promontory n.

mid-15c., "projecting, jutting out, standing out beyond the line or surface of something," from Latin prominentem (nominative prominens) "prominent," present participle of prominere "jut or stand out, be prominent, overhang," from pro "before, forward" (see pro-) + -minere "project, jut out," which is related to mons "hill" (from PIE root *men- (2) "to project").

Of features, "conspicuous, standing out so as to strike the mind or eye," from 1759; of persons, "notable, leading, eminent, standing out from among the multitude," from 1849. Related: Prominently.

Proto-Indo-European root meaning "to project." 

It forms all or part of: amenable; amount; cismontane; demeanor; dismount; eminence; eminent; imminence; imminent; menace; minacious; minatory; mons; montage; montagnard; monte; mount (n.1) "hill, mountain;" mount (v.) "to get up on;" mountain; mountebank; mouth; Osmond; Piedmont; promenade; prominence; prominent; promontory; remount; surmount; ultramontane.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit manya "nape of the neck;" Latin mons "mountain," eminere "to stand out;" Old Irish muin "neck," Welsh mwnwgl "neck," mwng "mane;" Welsh mynydd "mountain."