British spelling of gelatinize; to convert into gelatin or make something gelatinous.
From 'gelatin' + '-ise' (British verb suffix). This spelling reflects British English conventions, where '-ise' endings are standard for many verbs, whereas American English typically uses '-ize.'
If you're reading a British cookbook from the Victorian era, you'll see 'gelatinise' everywhere—it's the same process we call 'gelatinize' in America, just spelled the way British writers preferred.
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