Definition of Gigantostraca
: a group of arthropods comprising the eurypteroids and sometimes related forms including the xiphosurans — compare merostomata
gigantostracan\¦jīˌgan‧¦tästrə̇kən; jī¦g-, jə̇¦g-\ adjective or noun
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Origin and Etymology of gigantostraca
New Latin, from gigant- + -ostraca
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