a part that is joined to something larger | a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin |
an external body part that projects from the body | 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 |
a natural prolongation or projection from a part of an organism either animal or plant | the series of vertebrae forming the axis of the skeleton and protecting the spinal cord |
| a small sharp-pointed tip resembling a spike on a stem or leaf |
| any sharply pointed projection |