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noun
An armoured, jawless fossil fish (ostracoderm) of the family Pteraspididae (formerly Pteraspidae), found in rocks of the Silurian and Devonian periods.
adjective
Of, relating to, or characteristic of the family Pteraspididae.
Origin
Late 19th century. From pteraspid-, taken as stem of scientific Latin Pteraspis Pteraspis see -id. Compare scientific Latin Pteraspidae, former family name.
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