Is there a difference between spine and backbone in use or in meaning? I think they both mean the same and can be replaced by each other. However, I'd say backbone is used more in figurative speech, but this is just a guess on my part.
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Backbone and spine are both common names for the vertebral column, the series of bones from one's head to pelvis. In my personal opinion, backbone comes across as more of an informal name than spine.
It is worth noting that both of these words, however, have other meanings as well:
As reported by the NOAD, the meaning of backbone is:
For those meanings, there is a similar meaning for spine.
In zoology and botany, spine is also any hard pointed defensive projection or structure, while in geology it means also "a tall mass of viscous lava extruded from a volcano."
The term "backbone" is pretty much restricted to a single idiom: to "show some backbone," which means to be brave or resolute.
In this phrase, you can substitute the word "spine," and the meaning is unchanged. In almost any other conceivable instance, you'll want the word "spine," as in, "she injured her spine in the accident."
Edit: The above only refers to mammalian physiology. Figurative or metaphorical uses of "backbone," such as "ATT is the backbone of the Internet" or such is a different matter.
protected by RegDwigнt♦ Mar 5 '12 at 15:14
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