rusk
Concise Oxford English Dictionary © 2008 Oxford University Press:
rusk/rʌsk/
▶noun chiefly Brit. a dry biscuit or piece of twice-baked bread, especially as prepared for use as baby food.
– origin C16: from Sp. or Port. rosca ‘twist, coil, roll of bread’, of unknown ultimate origin.
'rusk' also found in these Oxford entries:

