spire1
n.
- a tapering conical or pyramidal structure on the top of a building, typically a church tower.
- the continuation of a tree trunk above the point where branching begins.
Derivative
Etymology
OE spīr ‘tall slender stem of a plant’.
spire2
n.
Zoology the upper tapering part of the spiral shell of a gastropod mollusc.
Etymology
C16: from Fr., or via L. from Gk speira ‘a coil’.