Lenticular
Lenticular. A shape of a medal like a lens, made with rounded edges and struck from dies made from two domed models. The shape would be described as convex-convex.
Medals struck from a pair of old dies which both have sunk excessively would exhibit somewhat of a lenticular shaped piece. See domed.excerpted with permission from
An Encyclopedia of Coin and Medal Technology
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor