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spine

 
 
pronunciation:
spaIn
features:
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part of speech: noun
definition 1: the backbone; spinal column.
He couldn't walk after he injured his spine.
 
synonyms:
backbone, spinal column, vertebrae
similar words:
back
definition 2: a sharp, pointed part that sticks out on certain plants or animals.
Cactus plants and porcupines both have spines.
synonyms:
quill
similar words:
thorn
definition 3: a stiff, hard back or ridge, such as the back part of a book or the narrow peak of a mountain.
synonyms:
ridge
derivation: spined (adj.)
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  book, mountain