In a manner that is gel-like, sticky, or having the texture or appearance of gelatin.
From gelatinous (adjective, meaning 'like gelatin') plus -ly (adverb suffix). The adjective gelatinous comes from gelatin, which itself comes from Latin gelatus 'frozen.'
The word 'gelatinously' perfectly captures how certain deep-sea creatures move—with a wobbly, jiggly motion—because their bodies are mostly water held together by gelatinous proteins, letting them survive crushing ocean pressure.
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