METAZOA
Metazoa, subkingdom Metazoa
(noun) multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system
METAZOAN
metazoan
(noun) any animal of the subkingdom Metazoa; all animals except protozoans and sponges
Source: WordNet® 3.1
Noun
metazoa pl (plural only)
(zoology) The multicellular animals of the subkingdom Metazoa considered collectively.
Source: Wiktionary
Met`a*zo"a, n. pl. Etym: [NL., fr. Gr. (Zoöl.)
Definition: Those animals in which the protoplasmic mass, constituting the
egg, is converted into a multitude of cells, which are metamorphosed
into the tissues of the body. A central cavity is commonly developed,
and the cells around it are at first arranged in two layers, -- the
ectoderm and endoderm. The group comprises nearly all animals except
the Protozoa.
METAZOON
Met`a*zo"ön, n. Etym: [NL.] (Zoöl.)
Definition: One of the Metazoa.
Source: Webster’s Unabridged Dictionary 1913 Edition