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plural caecilians
Any of a group of burrowing amphibians (order Gymnophiona or Apoda) that resemble earthworms or snakes. quotations examples
Today we have just three major lineages of amphibians - the anurans (frogs and toads), the newts and salamanders, and the worm-like caecilians, all of which can trace their ancestry back to long before the dinosaurs.
2018, Tim Flannery, Europe: A Natural History, page 50