A hard, dry biscuit or cookie that is often eaten with tea or given to babies for teething.
From Portuguese 'rosca' meaning coil or spiral bread, borrowed into English around the 1600s. The Portuguese borrowed it earlier from Spanish and possibly Latin roots referring to twisted bread.
Rusks were the original long-shelf-life survival food—sailors and soldiers carried them for months on voyages because they wouldn't spoil, making them the great-great-grandfather of modern energy bars.
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