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Definitions
An extinct armored jawed fish of the Paleozoic era.
Word origin
From placo- + -derm, after German Placoderm.
Used in a sentence
“Out to sea are placoderms – heavily armoured fish, some of them more than six metres (twenty feet) long and equipped with massive, powerful jaws.”
“Research published recently on placoderm fish fossils from Scottish Devonian lakes (around 365 myo) found evidence for how this extinct group of animals copulated.”
Source: Wiktionary, CC BY-SA 4.0
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