verb (used without object)
to congeal; become jellylike in consistency.
to become clear, substantial, or definite; crystallize: The plan began to jell once we all met to discuss it.
verb (used with object)
to cause to jell.

1820–30; back formation from jelly

half-jelled, adjective
unjelled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jell or gel (dʒɛl)
vb , jells, jelling, jelled, gels, gelling, gelled
1.  to make or become gelatinous; congeal
2.  (intr) to assume definite form: his ideas have jelled
3.  (US) an informal word for jelly
[C19: back formation from jelly1]
gel or gel
[C19: back formation from jelly1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1830, Amer.Eng. back-formation of jelly. Figurative sense is first attested 1908. M.E. had gelen "congeal," but it disappeared 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Emulsions produced from an oil well may freeze, jell, or solidify and block the flow line.
If using molds, loosen the jell by running a blunt knife around the edges.
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