frazil
Concise Oxford English Dictionary © 2008 Oxford University Press:
frazil /ˈfreɪz(ə)l, frəˈzɪl/
▶noun N. Amer. an accumulation of ice crystals in water that is too turbulent to freeze solid.
– origin C19: from Canad. Fr. frasil, from Fr. fraisil ‘cinders’.
'frazil' also found in these Oxford entries:

