inconnu
Concise Oxford English Dictionary © 2008 Oxford University Press:
inconnu /ˈãkɒnuː, ˌãkɒˈn(j)uː/
▶noun (pl. same) an edible freshwater whitefish related to the salmon. [Stenodus leucichthys.]
– origin C19: Fr., lit. ‘unknown’.
'inconnu' also found in these Oxford entries:

