the GNU version of the Collaborative International Dictionary of English
noun-plural. The lowest of the grand divisions of the animal kingdom.
The Century Dictionary and Cyclopedia
Primordial or first-formed animals, or cell-animals; protozoans: a subkingdom of Animalia or prime division of animals, contrasted with Metazoa, or all other animals collectively.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers
Word Usage
"In other words, the existence of H1 in protozoa may best be explained by the existence of H1 in metazoans."