Mesozoa
[ mez-uh-zoh-uh, mes-, mee-zuh-, -suh- ]
/ ˌmɛz əˈzoʊ ə, ˌmɛs-, ˌmi zə-, -sə- /
noun Zoology.
the phylum of invertebrates comprising the mesozoans, parasitic wormlike multicellular organisms sometimes considered to be intermediate in complexity between protozoans and metazoans.