archivolt
Concise Oxford English Dictionary © 2008 Oxford University Press:
archivolt /ˈɑːkɪvəʊlt/
▶noun a band of mouldings round the lower curve of an arch.
■ the lower curve itself.
– origin C17: from Fr. archivolte or Ital. archivolto, based on L. arcus ‘bow, arch’ + volvere ‘to roll’.
'archivolt' also found in these Oxford entries:

