plural noun
Pla·​gi·​os·​to·​mi | \ˌplājēˈästəˌmī\

Definition of Plagiostomi 

in some especially former classifications

: a group of fishes more or less exactly equivalent to Chondrichthyes or more restrictedly an order including the existing sharks and rays as distinguished from the chimaeras and the extinct primitive groups Pleuropterygii and Ichthyotomi — compare selachii

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History and Etymology for Plagiostomi

New Latin, from plagi- + -stomi

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a soft lustrous wool fabric with mohair

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