Ivory's formed from dentine and constitutes the bulk of the teeth and tusks of animals such as the elephant, hippopotamus, walrus, mammoth and narwhal. The word "ivory" was traditionally applied to the tusks of elephants; the word's ultimately from Ancient Egyptian âb, âbu "elephant", through the Latin ebor- or ebur. Ivory has availed itself to many ornamental and practical uses. Prior to the introduction of plastics, it was used for billiard balls, piano keys, Scottish bagpipes, bu… (More on Ivory)