pin·na·cle
ˈpi-ni-kəl
1
: an upright architectural member generally ending in a small spire and used especially in Gothic construction to give weight especially to a buttress
2
: a structure or formation suggesting a pinnacle
specifically
: a lofty peak
3
: the highest point of development or achievement : acme
pinnacled; pinnacling
ˈpi-ni-k(ə-)liŋ
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Merriam-Webster unabridged
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