noun mal·a·cos·tra·can \ˌma-lə-ˈkäs-tri-kən\

Definition of malacostracan

  1. :  any of a large subclass (Malacostraca) of crustaceans having a thorax consisting of eight segments usually covered by a carapace and including the decapods and isopods



Origin and Etymology of malacostracan

ultimately from Greek malakostrakos soft-shelled, from malakos soft + ostrakon shell — more at mollify, oyster

First Known Use: 1835

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