(definition) by Webster 1913 Wed Dec 22 1999 at 1:01:16

Mal`a*cos"tra*ca (?), n. pl. [NL., from Gr. soft + shell of a testacean.] Zool.

A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.

 

© Webster 1913.

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