crenel
Concise Oxford English Dictionary © 2008 Oxford University Press:
crenel /ˈkrɛn(ə)l/ (also crenelle /krɪˈnɛl/)
▶noun an indentation in the battlements of a building.
– origin C15: from OFr., based on pop. L. crena ‘notch’.
'crenel' also found in these Oxford entries:

