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nouna small sharp-pointed tip resembling a spike on a stem or leaftype of:
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nounthe series of vertebrae forming the axis of the skeleton and protecting the spinal cord
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nounany sharply pointed projectiontype of:
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nounthe part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
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nouna sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin