Etymology
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rusk (n.)

"light, crisp bits of hard bread or biscuit" ("formerly much used on board ships" - OED), 1590s, from Spanish or Portuguese rosca "roll, twist of bread," literally "coil, anything round and spiral," a word of unknown origin, perhaps from a pre-Latin Iberian language.

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Definitions of rusk

rusk (n.)
slice of sweet raised bread baked again until it is brown and hard and crisp;
Synonyms: zwieback / Brussels biscuit / twice-baked bread
From wordnet.princeton.edu