First Known Use: 1835
Dictionary
malacostracan
noun mal·a·cos·tra·can \ˌma-lə-ˈkäs-tri-kən\
Definition of MALACOSTRACAN
: 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
— malacostracan adjective
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