What is define spire?

Spire is a narrow, sharply pointed structure that is typically found on the roof or top of a building. It serves a decorative or architectural purpose, and is often used to create a sense of grandeur or height. Spire can also be used as a term to describe the tall, conical shape of a mountain peak. The word is derived from the Old English word "spir," which means a stalk of grass or a shoot. In architecture, spires can be made of various materials such as stone, metal, or wood, and can range in size from small decorative elements to towering structures that dominate the skyline. Some of the most famous spires in the world include the Eiffel Tower in Paris, the Washington Monument in Washington D.C., and the Empire State Building in New York City.