exergue
Concise Oxford English Dictionary © 2008 Oxford University Press:
exergue /ɪkˈsəːg, ɛkˈsəːg, ˈɛksəːg/
▶noun a small space or inscription below the principal emblem on a coin or medal, usually on the reverse side.
– origin C17: from Fr., from med. L. exergum, from ex- ‘out’ + Gk ergon ‘work’.
'exergue' also found in these Oxford entries:

