A tapering conical or pyramidal structure on the top of a building, typically a church tower. The church's spire could be seen from miles away, standing tall against the skyline.
A slender, pointed formation, such as a rock or mountain peak. The hikers were awed by the spire of rock that jutted out from the mountain range.
A slender shoot, stalk, or blade of grass or other plant (archaic, botany). In spring the green spires of barley covered the hillside.