A type of luminescent marine worm that produces light, or a larval stage of certain beetles that creates a bright appearance.
Compound word: 'fire' (from Old English 'fȳr') plus 'worm' (from Old English 'wyrm'). Named for the creature's ability to produce light, resembling fire.
Fireworms are real creatures that light up the ocean with bioluminescence—seeing millions of them glowing in the water is so magical that Spanish conquistadors thought they'd discovered undersea treasure, when really they were just watching tiny worms!
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