Definitions from Wiktionary (spine)

▸ noun:  (anatomy, zootomy) A series of bones situated at the back from the head to the pelvis of a human, or from the head to the tail of an animal, enclosing the spinal cord and providing support for the thorax and abdomen.
▸ noun:  (figurative) Courage or assertiveness.
▸ noun:  Something resembling a backbone, such as a ridge, or a long, central structure from which other structures radiate.
▸ noun:  The narrow, bound edge of a book that encloses the inner edges of the pages, facing outwards when the book is on a shelf and typically bearing the title and the author's and publisher's name.
▸ noun:  (zootomy, botany, mycology) A pointed, fairly rigid protuberance or needlelike structure on an animal, shell, mushroom or plant.
▸ noun:  (botany) The heartwood of trees.
▸ noun:  A linear payscale operated by some large organizations that allows flexibility for local and specific conditions.
▸ noun:  (geology) A tall mass of viscous lava extruded from a volcano.
▸ noun:  The stiffness of an arrow.
▸ noun:  (neuroscience) Ellipsis of dendritic spine.. [A small membranous protrusion from the dendrite of a neuron that typically receives input from a single axon at the synapse.]
▸ Also see spine

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