v. jelled, jell·ing, jells
1. To become firm or gelatinous; congeal.
2. To take shape or become clear; crystallize: A plan of action finally jelled in my mind.
1. To cause to become firm or gelatinous: used pectin to jell the jam.
2. To cause to take shape; make clear and definite; crystallize.
[Probably back-formation from JELLY.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.