Spire meaning : The stalk or stem of a plant. A young shoot of a plant; a spear. Any of various tall grasses, rushes, or sedges, such as the marram, the reed canary-grass, etc. A sharp or tapering point. A tapering structure built on a roof or tower, especially as one of the central architectural features of a church or cathedral roof. The top, or uppermost point, of anything; the summit. A tube or fuse for communicating fire to the charge in blasting. (of a seed, plant etc.) to sprout, to send forth the early shoots of growth; to germinate. To grow upwards rather than develop horizontally. To furnish with a spire.