Metazoa

[metә'zәuә]

Definition

(noun.) multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system.

Typed by Clarissa--From WordNet

Definition

(n. pl.) 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.

Inputed by Isabella

Definition

n.pl. many-celled animals possessing cellular differentiation:—opp. to single-celled Protozoa.—adjs. Metazō′an Metazō′ic.—n.sing. Met′azōon.

Checker: Thelma