the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

any sharply pointed projection

a small sharp-pointed tip resembling a spike on a stem or leaf

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 sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin

of a plant tipped with a spine

a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones

a spinel used as a gemstone (usually dark red)

weak in willpower, courage or vitality

lacking a backbone or spinal column

lacking spiny processes

lacking thorns

the quality of lacking a strong character; an irresolute disposition

a small and compactly built upright piano

early model harpsichord with only one string per note