One of the mysteries of the English language finally explained.
A translucent gelatinous mass found on the ground, vegetation, etc., formerly believed to be an emanation from the stars, the remains of meteors, or of fungal or animal origin, but now generally identified as colonies of the cyanobacteria Nostoc.
Early 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From star + jelly.
star jelly/ˌstɑː ˈdʒɛli/
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