from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A taxonomic class within the phylum Arthropoda — the horseshoe crabs.
from the GNU version of the Collaborative International Dictionary of English
- plural proper n. A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs (Limulus) of the last group. See limulus.
from The Century Dictionary and Cyclopedia
- A group of articulated animals to which various values and limits have been assigned.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. used in some classifications; includes the orders Xiphosura and Eurypterida
From Ancient Greek μέρος (meros, "part") + στόμα (stoma, "mouth"). (Wiktionary)