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Spire, in architecture, steeply pointed pyramidal or conical termination to a tower. In its mature Gothic development, the spire was an elongated, slender form that was a spectacular visual culmination of the building as well as a symbol of the heavenly aspirations of pious medieval men. The spire originated in the 12th century as a simple, four-sided pyramidal roof, generally abrupt and stunted, capping a church tower. Its history is a development toward slimmer, higher...