Pin"na*cle (?), n. [OE. pinacle, F. pinacle, L. pinnaculum, fr. pinna
pinnacle, feather. See Pin a peg.] 1. (Arch.) An architectural member,
upright, and generally ending in a small spire, -- used to finish a
buttress, to constitute a part in a proportion, as where pinnacles
flank a gable or spire, and the like. Pinnacles may be considered
primarily as added weight, where it is necessary to resist the thrust
of an arch, etc.
Some renowned metropolis With glistering spires and pinnacles
around.
Milton.