zoecium

/zoʊˈiːʃiəm/
noun
  1. The individual living chamber or compartment that houses a single zooid in a bryozoan colony.
    • Fossilized bryozoans are often identified by the shape of their zoecium.
    • Each zoecium is a tiny, box-like structure made of calcium carbonate.
    • The bryozoan colony grows by adding new zoecium to its edges.
Synonyms
What does "zoecium" mean? | whatsthatwordmean | whatsthatwordmean