portcullis
Concise Oxford English Dictionary © 2008 Oxford University Press:
portcullis/pɔːtˈkʌlɪs/
▶noun a strong, heavy grating that can be lowered down grooves on each side of a gateway to block it.
– derivatives
portcullised adjective.
portcullised adjective.
– origin ME: from OFr. porte coleice ‘sliding door’.
'portcullis' also found in these Oxford entries:

