exergual

adjective

ex·​ergu·​al

(ˈ)ek¦sərgəl,

(ˈ)eg¦zər-

: relating to the exergue of a coin or medal

… previously unexplained reverse exergual designs … were intended as cartographic representations

—R. G. Doty, Mercator's World, July/August 1997

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