- a muslin bag used to strain off the juice from the fruit in making jelly (the preserve)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for jelly bag
Then transfer them to a jelly-bag, and squeeze out the juice.
Then put them into a jelly-bag, and squeeze out all the juice.
The quince pulp that remains in the jelly-bag can be made into marmalade.
Let it pass through the jelly-bag again—when cool, turn it into glasses.
One of the ladies dropped the jelly-bag, the other shrieked out, Oh!Johnny Ludlow. First Series
Mrs. Henry Wood