Merci Bullfrog,
As I posted earlier, I knew the answer was FORCAT as I had heard the word previously but I couldn't find it in my dictionary or on line. Thanks for pointing me to the confirmation. Diolch yn fawr.
Pocket Oxford-Hachette French Dictionary © 2005 Oxford University Press:
forçat /fɔʀsa/
masculine noun
convict;
galley slave.