A projection of bone or other stiff tissue, such as the ridges in some insects' stridulatory organs.
A small piece of plastic, metal, ivory, etc., for plucking the strings of a guitar, lyre, mandolin, etc.
A series of bones situated at the back from the head to the pelvis of a human, or from the head to the tail of an animal, enclosing the spinal cord and providing support for the thorax and abdomen.
The stiffness of an arrow.
Courage or assertiveness.
The narrow, bound edge of a book that encloses the inner edges of the pages, facing outwards when the book is on a shelf and typically bearing the title and the author's and publisher's name.
The heartwood of trees.
A pointed, fairly rigid protuberance or needlelike structure on an animal, shell, or plant.
Something resembling a backbone, such as a ridge, or a long, central structure from which other structures radiate.
A linear payscale operated by some large organizations that allows flexibility for local and specific conditions.
A tall mass of viscous lava extruded from a volcano.