1. (n.) The topmost point; the peak of a structure or mountain\; 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.

2. (n.) Anything resembling a pinnacle; a lofty peak; a pointed summit.

3. (v. t.) To build or furnish with a pinnacle or pinnacles.

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