from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A taxonomic class within the subphylum Crustacea — most crustacea - crabs, lobsters, shrimps etc., which have soft shells after moulting.
from the GNU version of the Collaborative International Dictionary of English
- plural proper n. A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.
from The Century Dictionary and Cyclopedia
- n. One of two main divisions of the Crustacea proper; the division which is contrasted with Entomostraca.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies
From malaco- ("soft") + Ancient Greek ὄστρακον (ostrakon, "shell"). (Wiktionary)