Might mean (unverified): Marine worms with segmented bodies.
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We found one dictionary that defines the word polychaetan:

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  1. polychaetan: Wiktionary

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Definitions from Wiktionary (polychaetan)

▸ adjective:  Relating to polychaetes

Similar:
polynoid, chaetal, oligochaetological, polypian, polypean, arthropodic, polyneopterous, pleopodal, ptychonomous, pleiochasial, more...

Opposite:
oligochaete, monochaete, apterous

▸ Words similar to polychaetan

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▸ Popular nouns described by polychaetan

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▸ Rhymes of polychaetan

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Similar:
polynoid, chaetal, oligochaetological, polypian, polypean, arthropodic, polyneopterous, pleopodal, ptychonomous, pleiochasial, more...

Opposite:
oligochaete, monochaete, apterous



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