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c.1300, "mountain, peak, promontory," from Old French pinacle "top, gable" (13c.) and directly from Late Latin pinnaculum "peak, pinnacle, gable," diminutive of Latin pinna "peak, point," (see pin (n.1)). Figurative use is attested from c.1400.
a little wing, (Matt. 4:5; Luke 4:9). On the southern side of the temple court was a range of porches or cloisters forming three arcades. At the south-eastern corner the roof of this cloister was some 300 feet above the Kidron valley. The pinnacle, some parapet or wing-like projection, was above this roof, and hence at a great height, probably 350 feet or more above the valley.
in architecture, vertical ornament of pyramidal or conical shape, crowning a buttress, spire, or other architectural member. A pinnacle is distinguished from a finial by its greater size and complexity and from a tower or spire by its smaller size and subordinate architectural role. A tower may be decorated with pinnacles, each one capped by a finial.