(noun.) a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin.
(noun.) the 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; 'the title and author were printed on the spine of the book'.
(noun.) a small sharp-pointed tip resembling a spike on a stem or leaf.
校对:马奇
贝丝编辑