To congeal, freeze, or solidify; to become jelly-like or thickened (archaic or dialect).
From Old French 'geler' meaning to freeze, from Latin 'gelare' (to freeze); related to 'gelid' and 'gel,' describing the process of liquid becoming solid.
Words like 'geal' have almost completely disappeared from everyday English, but you can see the same root in 'gelatin' and 'jello'—so when you jiggle Jello, you're watching a 'gealed' dessert, even if nobody uses that verb anymore!
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