Learner's definition of JELLY
1 : a sweet and soft food made by boiling sugar and fruit juice until it is thick
— sometimes used figuratively
He spread some jelly on his toast.
a jar of grape jelly
a peanut butter and jelly sandwich
a jelly doughnut [=a doughnut with jelly inside of it]
2 [noncount], British : a fruit-flavored dessert made with gelatin
◊ In the U.S., this kind of dessert is known by the trademark Jell-O.
3 [noncount], old-fashioned : a food made from meat juices and gelatin 4 : a substance that is soft and thick like jelly