Webster's English Dictionary

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pinnacle

Cross references:
  1. summit                
 
1. pin.na.cle \'pin-i-k*l\ n [ME pinacle, fr. MF, fr. LL pinnaculum gable, 
   fr. dim. of L pinn]a wing, battlement 1: an upright architectural member 
   generally ending in a small spire and us ed esp. in Gothic construction to 
   give weight to a buttress or angle pier 2: a structure or formation 
   suggesting a pinnacle; specif : a lofty  peak 3: the highest point of 
   development or achievement : ACME 
2. pinnacle \-k(*-)lin\ vt or pin.na.cling 1: to surmount with a pinnacle  
   2: to raise or rear on a pinnacle