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.

Origin of Mesozoa

From New Latin, dating back to 1875–80; see origin at meso-, -zoa