[pin.na.cle] n [ME pinacle, fr. MF, fr. LL pinnaculum small wing, gable, fr. L pinna wing, battlement] (14c) 1: an upright architectural member generally ending in a small spire and used esp. in Gothic construction to give weight esp. to a buttress
2: a structure or formation suggesting a pinnacle; specif: a lofty peak
3: the highest point of development or achievement: acme syn see summit
[2]pinnacle vt -cled ; -cling (14c) 1: to surmount with a pinnacle
2: to raise or rear on a pinnacle