The hard, white, opaque, fine-grained substance constituting the tusks of the elephant. It is a variety of dentine, characterized by the minuteness and close arrangement of the tubes, as also by their double flexure. It is used in manufacturing articles of ornament or utility.
The opaque, creamy white, hard, fine-grained, modified dentine that composes the upper incisor teeth (tusks) of an elephant, walrus, mammoth, or mastodon. Ivory is composed of curved layers of dentine alternating in shade, and intersecting one another. The resulting lozenge-shaped structure is elastic and finely grained. It is one of the most beautiful and expensive materials for mounting bagpipes.