from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A taxonomic phylum within the superphylum Protostomia — the molluscs.
from the GNU version of the Collaborative International Dictionary of English
- plural proper n. One of the grand divisions of the animal kingdom, a phylum including the classes Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, and Pelecyopoda (syn. Bivalvia, formerly called Lamellibranchiata, or Conchifera). These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve.
From Latin mollusca, feminine singular of molluscus ("soft"), from mollis ("soft"). (Wiktionary)