Definify.com
Webster 1913 Edition
Rusk
Rusk
,Noun.
 [Sp. 
rosca de mar 
sea rusks, a kind of biscuit, rosca 
properly meaning, a screw, spiral.] 1. 
A kind of light, soft bread made with yeast and eggs, often toasted or crisped in an oven; or, a kind of sweetened biscuit. 
2. 
A kind of light, hard cake or bread, as for stores. 
Smart.
 3. 
Bread or cake which has been made brown and crisp, and afterwards grated, or pulverized in a mortar. 
Webster 1828 Edition
Rusk
RUSK
, n.1.
  A kind of light cake.2.
  Hard bread for stores.Definition 2025
Rusk
rusk
rusk
See also: Rusk
English
Noun
rusk (countable and uncountable, plural rusks)

Zwieback
-  a rectangular, hard, dry biscuit
-  1719: Daniel Defoe, Robinson Crusoe
- ...he brought a large basket of rusk or biscuit, and three jars of fresh water, into the boat.
 
 
 -  1719: Daniel Defoe, Robinson Crusoe
 -  a twice-baked bread, slices of bread baked until they are hard and crisp (also called a zwieback)
-  1956, Delano Ames, chapter 25, in Crime out of Mind:
- A newly-arrived couple at the next table […] admitted that “this was more like” and that if the Alpenrose could also produce a proper cup of tea it would be just like home. Bill Andreyef, who was eating a lightly-boiled egg and a rusk, regarded the other diners with resentment.
 
 
 -  
 - a weaning food for children
 - a cereal binder used in meat product manufacture
 
Synonyms
- Brussels biscuit
 - twice-baked bread
 - zwieback
 
Translations
light, soft bread, often toasted or crisped in an oven
  | 
Faroese
Pronunciation
- IPA(key): [ɹʊsk]
 
Noun
rusk n (genitive singular rusks, plural rusk)
Declension
| n3 | Singular | Plural | ||
| Indefinite | Definite | Indefinite | Definite | |
| Nominative | rusk | ruskið | rusk | ruskini | 
| Accusative | rusk | ruskið | rusk | ruskini | 
| Dative | ruski | ruskinum | ruskum | ruskunum | 
| Genitive | rusks | rusksins | ruska | ruskanna |