- metazoan⇄adj. of or belonging to the metazoans.
- metazoan⇄metazoan, noun, adjective.
- metazoan⇄noun any one of a large subkingdom of animals, comprising all animals except the protozoans (or animallike protistans), having the body made up of many cells arranged in tissues, developing from a single cell. Many scientists do not include the sponges