Definitions

1. noun

A layer of hard, calcareous or silicous material produced by the secretions of encrusting organisms, such as bryozoans, in colonial organisms.

“The coenosteum of the colonial organism provided it with a hard protective coating.”

2. noun

A layer of hard, calcareous or silicous material produced by the secretions of certain corals.

“The coenosteum of the coral reef helped to create a unique ecosystem.”