What is "pinacoderm"

n. The outer most layer of cells (''pinacocytes'') in the phylum Porifera (sponges), equivalent to the epidermis, and characterized as an epithelial layer of flattened cells.

The pinacoderm is the outer most layer of cells (pinacocytes) surrounding the body of organisms belonging to the phylum Porifera ( sponges), equivalent to the epidermis in other organisms.