Malacostracan definition

maləkästrəkən
Of a large class (Malacostraca) of highly evolved crustaceans typically consisting of 19 segments, including the decapods, krill, and isopods.
adjective
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Such a crustacean.
noun
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(zoology) Any of very many crustaceans of the class Malacostraca.
noun
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Other Word Forms

Noun

Singular:
malacostracan
Plural:
malacostracans